<?php
/*********************************************************************************/
/**
 * iCalcreator class v2.6
 * copyright (c) 2007-2008 Kjell-Inge Gustafsson kigkonsult
 * www.kigkonsult.se/iCalcreator/index.php
 * ical@kigkonsult.se
 *
 * Description:
 * This file is a PHP implementation of RFC 2445.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
/*********************************************************************************/
/*********************************************************************************/
/*         A little setup                                                        */
/*********************************************************************************/
            /* your local language code */
// define( 'ICAL_LANG', 'sv' );
            // alt. autosetting
/*
$langstr     = $_SERVER['HTTP_ACCEPT_LANGUAGE'];
$pos         = strpos( $langstr, ';' );
if ($pos   !== false) {
  $langstr   = substr( $langstr, 0, $pos );
  $pos       = strpos( $langstr, ',' );
  if ($pos !== false) {
    $pos     = strpos( $langstr, ',' );
    $langstr = substr( $langstr, 0, $pos );
  }
  define( 'ICAL_LANG', $langstr );
}
*/
/* only for phpversion 5.x, date management, default timezone setting */
if( substr( phpversion(), 0, 1) >= '5' ) // && ( 'UTC' == date_default_timezone_get() )) {
  date_default_timezone_set( 'Europe/Stockholm' );
            /* version string, do NOT remove!! */
define( 'ICALCREATOR_VERSION', 'iCalcreator 2.6' );
/*********************************************************************************/
/*********************************************************************************/
/**
 * vcalendar class
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.13 - 2007-12-30
 */
class vcalendar {
            //  calendar property variables
  var $calscale;
  var $method;
  var $prodid;
  var $version;
  var $xprop;
            //  container for calendar components
  var $components;
            //  component config variables
  var $allowEmpty;
  var $unique_id;
  var $language;
  var $directory;
  var $filename;
  var $url;
  var $delimiter;
  var $nl;
  var $format;
            //  component internal variables
  var $attributeDelimiter;
  var $valueInit;
            //  component xCal declaration container
  var $xcaldecl;
/*
 * constructor for calendar object
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.13 - 2007-12-30
 * @return void
 */
  function vcalendar () {
    $this->_makeVersion();
    $this->calscale   = null;
    $this->method     = null;
    $this->_makeUnique_id();
    $this->prodid     = null;
    $this->xprop      = array();
/**
 *   language = <Text identifying a language, as defined in [RFC 1766]>
 */
    if( defined( 'ICAL_LANG' ))
      $this->setConfig( 'language', ICAL_LANG );
    $this->setConfig( 'allowEmpty', TRUE );
    $this->setConfig( 'nl',         "\n" );
    $this->setConfig( 'format',     'iCal');
    $this->directory  = null;
    $this->filename   = null;
    $this->url        = null;
    $this->setConfig( 'delimiter',  DIRECTORY_SEPARATOR );
    $this->xcaldecl   = array();
    $this->components = array();
  }
/*********************************************************************************/
/**
 * Property Name: CALSCALE
 */
/**
 * creates formatted output for calendar property calscale
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createCalscale() {
    if( empty( $this->calscale )) return FALSE;
    switch( $this->format ) {
      case 'xcal':
        return ' calscale="'.$this->calscale.'"'.$this->nl;
        break;
      default:
        return 'CALSCALE:'.$this->calscale.$this->nl;
        break;
    }
  }
/**
 * set calendar property calscale
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @param string $value
 * @return void
 */
  function setCalscale( $value ) {
    if( empty( $value )) return FALSE;
    $this->calscale = $value;
  }
/*********************************************************************************/
/**
 * Property Name: METHOD
 */
/**
 * creates formatted output for calendar property method
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-20
 * @return string
 */
  function createMethod() {
    if( empty( $this->method )) return FALSE;
    switch( $this->format ) {
      case 'xcal':
        return ' method="'.$this->method.'"'.$this->nl;
        break;
      default:
        return 'METHOD:'.$this->method.$this->nl;
        break;
    }
  }
/**
 * set calendar property method
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-20-23
 * @param string $value
 * @return bool
 */
  function setMethod( $value ) {
    if( empty( $value )) return FALSE;
    $this->method = $value;
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: PRODID
 *
 *  The identifier is RECOMMENDED to be the identical syntax to the
 * [RFC 822] addr-spec. A good method to assure uniqueness is to put the
 * domain name or a domain literal IP address of the host on which.. .
 */
/**
 * creates formatted output for calendar property prodid
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-20
 * @return string
 */
  function createProdid() {
    if( !isset( $this->prodid ))
      $this->_makeProdid();
    switch( $this->format ) {
      case 'xcal':
        return ' prodid="'.$this->prodid.'"'.$this->nl;
        break;
      default:
        return 'PRODID:'.$this->prodid.$this->nl;
        break;
    }
  }
/**
 * make default value for calendar prodid
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.3.0 - 2006-08-10
 * @return void
 */
  function _makeProdid() {
    $this->prodid  = '-//'.$this->unique_id.'//NONSGML '.ICALCREATOR_VERSION.'//'.strtoupper( $this->language );
  }
/**
 * Conformance: The property MUST be specified once in an iCalendar object.
 * Description: The vendor of the implementation SHOULD assure that this
 * is a globally unique identifier; using some technique such as an FPI
 * value, as defined in [ISO 9070].
 */
/**
 * make default unique_id for calendar prodid
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.3.0 - 2006-08-10
 * @return void
 */
  function _makeUnique_id() {
    $this->unique_id  = ( isset( $_SERVER['SERVER_NAME'] )) ? gethostbyname( $_SERVER['SERVER_NAME'] ) : 'localhost';
  }
/*********************************************************************************/
/**
 * Property Name: VERSION
 *
 * Description: A value of "2.0" corresponds to this memo.
 */
/**
 * creates formatted output for calendar property version

 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-20
 * @return string
 */
  function createVersion() {
    if( empty( $this->version ))
      $this->_makeVersion();
    switch( $this->format ) {
      case 'xcal':
        return ' version="'.$this->version.'"'.$this->nl;
        break;
      default:
        return 'VERSION:'.$this->version.$this->nl;
        break;
    }
  }
/**
 * set default calendar version
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.3.0 - 2006-08-10
 * @return void
 */
  function _makeVersion() {
    $this->version = '2.0';
  }
/**
 * set calendar version
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @param string $value
 * @return void
 */
  function setVersion( $value ) {
    if( empty( $value )) return FALSE;
    $this->version = $value;
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: x-prop
 */
/**
 * creates formatted output for calendar property x-prop, iCal format only
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.11 - 2008-11-03
 * @return string
 */
  function createXprop() {
    if( 'xcal' == $this->format )
      return false;
    if( 0 >= count( $this->xprop ))
      return;
    $output = null;
    $toolbox = new calendarComponent();
    $toolbox->setConfig( 'language', $this->getConfig( 'language' ));
    $toolbox->setConfig( 'nl',       $this->getConfig( 'nl' ));
    $toolbox->_createFormat(         $this->getConfig( 'format' ));
    foreach( $this->xprop as $label => $xpropPart ) {
      if( empty( $xpropPart['value'] )) {
        $output  .= $toolbox->_createElement( $label );
        continue;
      }
      $attributes = $toolbox->_createParams( $xpropPart['params'], array( 'LANGUAGE' ));
      if( is_array( $xpropPart['value'] )) {
        foreach( $xpropPart['value'] as $pix => $theXpart )
          $xpropPart['value'][$pix] = $toolbox->_strrep( $theXpart );
        $xpropPart['value']  = implode( ',', $xpropPart['value'] );
      }
      else
        $xpropPart['value'] = $toolbox->_strrep( $xpropPart['value'] );
      $output    .= $toolbox->_createElement( $label, $attributes, $xpropPart['value'] );
    }
    return $output;
  }
/**
 * set calendar property x-prop
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.11 - 2008-11-04
 * @param string $label
 * @param string $value
 * @param array $params optional
 * @return bool
 */
  function setXprop( $label, $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    if( empty( $label )) return FALSE;
    $xprop           = array( 'value' => $value );
    $toolbox         = new calendarComponent();
    $xprop['params'] = $toolbox->_setParams( $params );
    if( !is_array( $this->xprop )) $this->xprop = array();
    $this->xprop[strtoupper( $label )] = $xprop;
    return TRUE;
  }
/*********************************************************************************/
/**
 * delete calendar property value
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.5 - 2008-11-14
 * @param mixed $propName, bool FALSE => X-property
 * @param int @propix, optional, if specific property is wanted in case of multiply occurences
 * @return bool, if successfull delete
 */
  function deleteProperty( $propName, $propix=FALSE ) {
    $propName = ( $propName ) ? strtoupper( $propName ) : 'X-PROP';
    if( !$propix )
      $propix = ( isset( $this->propdelix[$propName] )) ? $this->propdelix[$propName] + 2 : 1;
    $this->propdelix[$propName] = --$propix;
    $return = FALSE;
    switch( $propName ) {
      case 'CALSCALE':
        if( isset( $this->calscale )) {
          $this->calscale = null;
          $return = TRUE;
        }
        break;
      case 'METHOD':
        if( isset( $this->method )) {
          $this->method   = null;
          $return = TRUE;
        }
        break;
      default:
        $reduced = array();
        if( $propName != 'X-PROP' ) {
          if( !isset( $this->xprop[$propName] )) return FALSE;
          foreach( $this->xprop as $k => $a ) {
            if(( $k != $propName ) && !empty( $a ))
              $reduced[$k] = $a;
          }
        }
        else {
          if( count( $this->xprop ) <= $propix )  return FALSE;
          $xpropno = 0;
          foreach( $this->xprop as $xpropkey => $xpropvalue ) {
            if( $propix != $xpropno )
              $reduced[$xpropkey] = $xpropvalue;
            $xpropno++;
          }
        }
        $this->xprop = $reduced;
        return TRUE;
    }
    return $return;
  }
/**
 * get calendar property value/params
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-02
 * @param string $propName, optional
 * @param int @propix, optional, if specific property is wanted in case of multiply occurences
 * @param bool $inclParam=FALSE
 * @return mixed
 */
  function getProperty( $propName=FALSE, $propix=FALSE, $inclParam=FALSE ) {
    $propName = ( $propName ) ? strtoupper( $propName ) : 'X-PROP';
    if( 'X-PROP' == $propName ) {
      if( !$propix )
        $propix = ( isset( $this->propix[$propName] )) ? $this->propix[$propName] + 2 : 1;
      $this->propix[$propName] = --$propix;
    }
    switch( $propName ) {
      case 'CALSCALE':
        return ( !empty( $this->calscale )) ? $this->calscale : null;
        break;
      case 'METHOD':
        return ( !empty( $this->method )) ? $this->method : null;
        break;
      case 'PRODID':
        if( empty( $this->prodid ))
          $this->_makeProdid();
        return $this->prodid;
        break;
      case 'VERSION':
        return ( !empty( $this->version )) ? $this->version : null;
        break;
      default:
        if( $propName != 'X-PROP' ) {
          if( !isset( $this->xprop[$propName] )) return FALSE;
          return ( $inclParam ) ? array( $propName, $this->xprop[$propName] )
                                : array( $propName, $this->xprop[$propName]['value'] );
        }
        else {
          if( empty( $this->xprop )) return FALSE;
          $xpropno = 0;
          foreach( $this->xprop as $xpropkey => $xpropvalue ) {
            if( $propix == $xpropno )
              return ( $inclParam ) ? array( $xpropkey, $this->xprop[$xpropkey] )
                                    : array( $xpropkey, $this->xprop[$xpropkey]['value'] );
            else
              $xpropno++;
          }
          return FALSE; // not found ??
        }
    }
    return FALSE;
  }
/**
 * general vcalendar property setting
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.13 - 2007-11-04
 * @param mixed $args variable number of function arguments,
 *                    first argument is ALWAYS component name,
 *                    second ALWAYS component value!
 * @return bool
 */
  function setProperty () {
    $numargs    = func_num_args();
    if( 1 > $numargs )
      return FALSE;
    $arglist    = func_get_args();
    $arglist[0] = strtoupper( $arglist[0] );
    switch( $arglist[0] ) {
      case 'CALSCALE':
        return $this->setCalscale( $arglist[1] );
      case 'METHOD':
        return $this->setMethod( $arglist[1] );
      case 'VERSION':
        return $this->setVersion( $arglist[1] );
      default:
        if( !isset( $arglist[1] )) $arglist[1] = null;
        if( !isset( $arglist[2] )) $arglist[2] = null;
        return $this->setXprop( $arglist[0], $arglist[1], $arglist[2] );
    }
    return FALSE;
  }
/*********************************************************************************/
/**
 * get vcalendar config values or * calendar components
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.10 - 2008-10-23
 * @param string $config
 * @return value
 */
  function getConfig( $config ) {
    switch( strtoupper( $config )) {
      case 'ALLOWEMPTY':
        return $this->allowEmpty;
        break;
      case 'COMPSINFO':
        unset( $this->compix );
        $info = array();
        foreach( $this->components as $cix => $component ) {
          if( empty( $component )) continue;
          unset( $component->propix );
          $info[$cix]['ordno'] = $cix + 1;
          $info[$cix]['type']  = $component->objName;
          $info[$cix]['uid']   = $component->getProperty( 'uid' );
          $info[$cix]['props'] = $component->getConfig( 'propinfo' );
          $info[$cix]['sub']   = $component->getConfig( 'compsinfo' );
          unset( $component->propix );
        }
        return $info;
        break;
      case 'DELIMITER':
        return $this->delimiter;
        break;
      case 'DIRECTORY':
        if( empty( $this->directory ))
          $this->directory = '.';
        return $this->directory;
        break;
      case 'DIRFILE':
        return $this->getConfig( 'directory' ).$this->getConfig( 'delimiter' ).$this->getConfig( 'filename' );
        break;
      case 'FILEINFO':
        return array( $this->getConfig( 'directory' )
                    , $this->getConfig( 'filename' )
                    , $this->getConfig( 'filesize' ));
        break;
      case 'FILENAME':
        if( empty( $this->filename )) {
          if( 'xcal' == $this->format )
            $this->filename = date( 'YmdHis' ).'.xml'; // recommended xcs.. .
          else
            $this->filename = date( 'YmdHis' ).'.ics';
        }
        return $this->filename;
        break;
      case 'FILESIZE':
        $size    = 0;
        if( empty( $this->url )) {
          $dirfile = $this->getConfig( 'dirfile' );
          if( FALSE === ( $size = filesize( $dirfile )))
            $size = 0;
          clearstatcache();
        }
        return $size;
        break;
      case 'FORMAT':
        return $this->format;
        break;
      case 'LANGUAGE':
         /* get language for calendar component as defined in [RFC 1766] */
        return $this->language;
        break;
      case 'NL':
      case 'NEWLINECHAR':
        return $this->nl;
        break;
      case 'UNIQUE_ID':
        return $this->unique_id;
        break;
      case 'URL':
        if( !empty( $this->url ))
          return $this->url;
        else
          return FALSE;
        break;
    }
  }
/**
 * general vcalendar config setting
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-24
 * @param string $config
 * @param string $value
 * @return void
 */
  function setConfig( $config, $value ) {
    $res = FALSE;
    switch( strtoupper( $config )) {
      case 'ALLOWEMPTY':
        $this->allowEmpty = $value;
        $subcfg  = array( 'ALLOWEMPTY' => $value );
        $res = TRUE;
        break;
      case 'DELIMITER':
        $this->delimiter = $value;
        return TRUE;
        break;
      case 'DIRECTORY':
        $value   = trim( $value );
        $nl      = $this->getConfig('delimiter');
        if( $nl == substr( $value, ( 0 - strlen( $nl ))))
          $value = substr( $value, 0, ( strlen( $value ) - strlen( $nl )));
        if( is_dir( $value )) {
            /* local directory */
          clearstatcache();
          $this->directory = $value;
          $this->url       = null;
          return TRUE;
        }
        else
          return FALSE;
        break;
      case 'FILENAME':
        $value   = trim( $value );
        if( !empty( $this->url )) {
            /* remote directory+file - URL */
          $this->filename = $value;
          return TRUE;
        }
        $dirfile = $this->getConfig( 'directory' ).$this->getConfig( 'delimiter' ).$value;
        if( file_exists( $dirfile )) {
            /* local existing file */
          if( is_readable( $dirfile ) || is_writable( $dirfile )) {
            clearstatcache();
            $this->filename = $value;
            return TRUE;
          }
          else
            return FALSE;
        }
        elseif( FALSE !== touch( $dirfile )) {
            /* new local file created */
          $this->filename = $value;
          return TRUE;
        }
        else
          return FALSE;
        break;
      case 'FORMAT':
        $value   = trim( $value );
        if( 'xcal' == strtolower( $value )) {
          $this->format             = 'xcal';
          $this->attributeDelimiter = $this->nl;
          $this->valueInit          = null;
        }
        else {
          $this->format             = null;
          $this->attributeDelimiter = ';';
          $this->valueInit          = ':';
        }
        $subcfg  = array( 'FORMAT' => $value );
        $res = TRUE;
        break;
      case 'LANGUAGE':
         // set language for calendar component as defined in [RFC 1766]
        $value   = trim( $value );
        $this->language = $value;
        $subcfg  = array( 'LANGUAGE' => $value );
        $res = TRUE;
        break;
      case 'NL':
      case 'NEWLINECHAR':
        $this->nl = $value;
        $subcfg  = array( 'NL' => $value );
        $res = TRUE;
        break;
      case 'UNIQUE_ID':
        $value   = trim( $value );
        $this->unique_id = $value;
        $subcfg  = array( 'UNIQUE_ID' => $value );
        $res = TRUE;
        break;
      case 'URL':
            /* remote file - URL */
        $value     = trim( $value );
        $value     = str_replace( 'HTTP://',   'http://', $value );
        $value     = str_replace( 'WEBCAL://', 'http://', $value );
        $value     = str_replace( 'webcal://', 'http://', $value );
        $this->url = $value;
        $this->directory = null;
        $parts     = pathinfo( $value );
        return $this->setConfig( 'filename',  $parts['basename'] );
        break;
    }
    if( !$res ) return FALSE;
    if( isset( $subcfg ) && !empty( $this->components )) {
      foreach( $subcfg as $cfgkey => $cfgvalue ) {
        foreach( $this->components as $cix => $component ) {
          $res = $component->setConfig( $cfgkey, $cfgvalue );
          if( !$res )
            break 2;
          $this->components[$cix] = $component->copy(); // PHP4 compliant
        }
      }
    }
    return $res;
  }
/*********************************************************************************/
/**
 * add calendar component to container
 *
 * alias to setComponent
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 1.x.x - 2007-04-24
 * @param object $component calendar component
 * @return void
 */
  function addComponent( $component ) {
    $this->setComponent( $component );
  }
/**
 * delete calendar component from container
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.10 - 2008-08-05
 * @param mixed $arg1 ordno / component type / component uid
 * @param mixed $arg2 optional, ordno if arg1 = component type
 * @return void
 */
  function deleteComponent( $arg1, $arg2=FALSE  ) {
    $argType = $index = null;
    if ( ctype_digit( (string) $arg1 )) {
      $argType = 'INDEX';
      $index   = (int) $arg1 - 1;
    }
    elseif(( strlen( $arg1 ) <= strlen( 'vfreebusy' )) && ( FALSE === strpos( $arg1, '@' ))) {
      $argType = strtolower( $arg1 );
      $index   = ( !empty( $arg2 ) && ctype_digit( (string) $arg2 )) ? (( int ) $arg2 - 1 ) : 0;
    }
    $cix1dC = 0;
    foreach ( $this->components as $cix => $component) {
      if( empty( $component )) continue;
      unset( $component->propix );
      if(( 'INDEX' == $argType ) && ( $index == $cix )) {
        unset( $this->components[$cix] );
        return TRUE;
      }
      elseif( $argType == $component->objName ) {
        if( $index == $cix1dC ) {
          unset( $this->components[$cix] );
          return TRUE;
        }
        $cix1dC++;
      }
      elseif( !$argType && ($arg1 == $component->getProperty( 'uid' ))) {
        unset( $this->components[$cix] );
        return TRUE;
      }
    }
    return FALSE;
  }
/**
 * get calendar component from container
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.10 - 2008-08-06
 * @param mixed $arg1 optional, ordno/component type/ component uid
 * @param mixed $arg2 optional, ordno if arg1 = component type
 * @return object
 */
  function getComponent( $arg1=FALSE, $arg2=FALSE ) {
    $index = $argType = null;
    if ( !$arg1 ) {
      $argType = 'INDEX';
      $index   = $this->compix['INDEX'] =
        ( isset( $this->compix['INDEX'] )) ? $this->compix['INDEX'] + 1 : 1;
    }
    elseif ( ctype_digit( (string) $arg1 )) {
      $argType = 'INDEX';
      $index   = (int) $arg1;
      unset( $this->compix );
    }
    elseif(( strlen( $arg1 ) <= strlen( 'vfreebusy' )) && ( FALSE === strpos( $arg1, '@' ))) {
      unset( $this->compix['INDEX'] );
      $argType = strtolower( $arg1 );
      if( !$arg2 )
        $index = $this->compix[$argType] =
        ( isset( $this->compix[$argType] )) ? $this->compix[$argType] + 1 : 1;
      else
        $index = (int) $arg2;
    }
    $index  -= 1;
    $ckeys =  array_keys( $this->components );
    if( !empty( $index) && ( $index > end(  $ckeys )))
      return FALSE;
    $cix1gC = 0;
    foreach ( $this->components as $cix => $component) {
      if( empty( $component )) continue;
      unset( $component->propix );
      if(( 'INDEX' == $argType ) && ( $index == $cix ))
        return $component->copy();
      elseif( $argType == $component->objName ) {
         if( $index == $cix1gC )
           return $component->copy();
         $cix1gC++;
      }
      elseif( !$argType && ($arg1 == $component->getProperty( 'uid' ))) {
        unset( $component->propix );
        return $component->copy();
      }
    }
            /* not found.. . */
    unset( $this->compix );
    return FALSE;
  }
/**
 * select components from calendar on date basis
 *
 * Ensure DTSTART is set for every component.
 * No date controls occurs.
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-18
 * @param int $startY optional,  start Year, default current Year
 * @param int $startM optional,  start Month, default current Month
 * @param int $startD optional,  start Day, default current Day
 * @param int $endY optional,    end Year, default $startY
 * @param int $endY optional,    end Month, default $startM
 * @param int $endY optional,    end Day, default $startD
 * @param mixed $cType optional, calendar component type(-s), default FALSE=all else string/array type(-s)
 * @param bool $flat optional,   FALSE (default) => output : array[Year][Month][Day][]
 *                               TRUE => output : array[] (ignores split)
 * @param bool $any optional,    TRUE (default) - select component that take place within period
 *                               FALSE - only components that starts within period
 * @param bool $split optional,  TRUE (default) - one component copy every day it take place during the
 *                                       period (implies flat=FALSE)
 *                               FALSE - one occurance of component only in output array</tr>
 * @return array or FALSE
 */
  function selectComponents( $startY=FALSE, $startM=FALSE, $startD=FALSE, $endY=FALSE, $endM=FALSE, $endD=FALSE, $cType=FALSE, $flat=FALSE, $any=TRUE, $split=TRUE ) {
            /* check  if empty calendar */
    if( 0 >= count( $this->components )) return FALSE;
            /* check default dates */
    if( !$startY ) $startY = date( 'Y' );
    if( !$startM ) $startM = date( 'm' );
    if( !$startD ) $startD = date( 'd' );
    $startDate = mktime( 0, 0, 0, $startM, $startD, $startY );
    if( !$endY )   $endY   = $startY;
    if( !$endM )   $endM   = $startM;
    if( !$endD )   $endD   = $startD;
    $endDate   = mktime( 23, 59, 59, $endM, $endD, $endY );
            /* check component types */
    $validTypes = array('vevent', 'vtodo', 'vjournal', 'vfreebusy' );
    if( is_array( $cType )) {
      foreach( $cType as $cix => $theType ) {
        $cType[$cix] = $theType = strtolower( $theType );
        if( !in_array( $theType, $validTypes ))
          $cType[$cix] = 'vevent';
      }
      $cType = array_unique( $cType );
    }
    elseif( !empty( $cType )) {
      $cType = strtolower( $cType );
      if( !in_array( $cType, $validTypes ))
        $cType = array( 'vevent' );
      else
        $cType = array( $cType );
    }
    else
      $cType = $validTypes;
    if( 0 >= count( $cType ))
      $cType = $validTypes;
            /* iterate components */
    $result = array();
    foreach ( $this->components as $cix => $component ) {
      if( empty( $component )) continue;
      unset( $component->propix, $start );
            /* deselect unvalid type components */
      if( !in_array( $component->objName, $cType )) continue;
            /* deselect components without dtstart set */
      if( FALSE === ( $start = $component->getProperty( 'dtstart' ))) continue;
      $dtendExist = $dueExist = $durationExist = $endAllDayEvent = FALSE;
      unset( $end, $startWdate, $endWdate, $rdurWsecs, $rdur, $exdatelist, $workstart, $workend ); // clean up
      $startWdate = $component->_date2timestamp( $start );
      $startDateFormat = ( isset( $start['hour'] )) ? 'Y-m-d H:i:s' : 'Y-m-d';
            /* get end date from dtend/due/duration properties */
      $end = $component->getProperty( 'dtend' );
      if( !empty( $end )) {
        $dtendExist = TRUE;
        $endDateFormat = ( isset( $end['hour'] )) ? 'Y-m-d H:i:s' : 'Y-m-d';
      }
   // if( !empty($end))  echo 'selectComp 1 start='.implode('-',$start).' end='.implode('-',$end)."<br />\n"; // test ###
      if( empty($end) && ( $component->objName == 'vtodo' )) {
        $end = $component->getProperty( 'due' );
        if( !empty( $end )) {
          $dueExist = TRUE;
          $endDateFormat = ( isset( $end['hour'] )) ? 'Y-m-d H:i:s' : 'Y-m-d';
        }
   // if( !empty($end))  echo 'selectComp 2 start='.implode('-',$start).' end='.implode('-',$end)."<br />\n"; // test ###
      }
      if( !empty( $end ) && !isset( $end['hour'] )) {
          /* a DTEND without time part regards an event that ends the day before,
             for an all-day event DTSTART=20071201 DTEND=20071202 (taking place 20071201!!! */
        $endAllDayEvent = TRUE;
        $endWdate = mktime( 23, 59, 59, $end['month'], ($end['day'] - 1), $end['year'] );
        $end['year']  = date( 'Y', $endWdate );
        $end['month'] = date( 'm', $endWdate );
        $end['day']   = date( 'd', $endWdate );
        $end['hour']  = 23;
        $end['min']   = $end['sec'] = 59;
   // if( !empty($end))  echo 'selectComp 3 start='.implode('-',$start).' end='.implode('-',$end)."<br />\n"; // test ###
      }
      if( empty( $end )) {
        $end = $component->getProperty( 'duration', FALSE, FALSE, TRUE );// in dtend (array) format
        if( !empty( $end ))
          $durationExist = TRUE;
   // if( !empty($end))  echo 'selectComp 4 start='.implode('-',$start).' end='.implode('-',$end)."<br />\n"; // test ###
      }
      if( empty( $end )) { // assume one day duration if missing end date
        $end = array( 'year' => $start['year'], 'month' => $start['month'], 'day' => $start['day'], 'hour' => 23, 'min' => 59, 'sec' => 59 );
   // if( isset($end))  echo 'selectComp 5 start='.implode('-',$start).' end='.implode('-',$end)."<br />\n"; // test ###
      }
      $endWdate = $component->_date2timestamp( $end );
      if( $endWdate < $startWdate ) { // MUST be after start date!!
        $end = array( 'year' => $start['year'], 'month' => $start['month'], 'day' => $start['day'], 'hour' => 23, 'min' => 59, 'sec' => 59 );
        $endWdate = $component->_date2timestamp( $end );
      }
      $rdurWsecs  = $endWdate - $startWdate; // compute component duration in seconds
      $rdur       = $component->_date2duration( $start, $end ); // compute component duration, array
            /* make a list of optional exclude dates for component occurence from exrule and exdate */
      $exdatelist = array();
      $workstart  = $component->_timestamp2date(( $startDate - $rdurWsecs ), 6);
      $workend    = $component->_timestamp2date(( $endDate + $rdurWsecs ), 6);
      while( FALSE !== ( $exrule = $component->getProperty( 'exrule' )))    // check exrule
        $component->_recur2date( $exdatelist, $exrule, $start, $workstart, $workend );
      while( FALSE !== ( $exdate = $component->getProperty( 'exdate' ))) {  // check exdate
        foreach( $exdate as $theExdate ) {
          $exWdate = $component->_date2timestamp( $theExdate );
          if((( $startDate - $rdurWsecs ) <= $exWdate ) && ( $endDate >= $exWdate ))
            $exdatelist[$exWdate] = TRUE;
        }
      }
            /* if 'any' components, check repeating components, removing all excluding dates */
      if( TRUE === $any ) {
            /* make a list of optional repeating dates for component occurence, rrule, rdate */
        $recurlist = array();
        while( FALSE !== ( $rrule = $component->getProperty( 'rrule' )))    // check rrule
          $component->_recur2date( $recurlist, $rrule, $start, $workstart, $workend );
        foreach( $recurlist as $recurkey => $recurvalue ) // key=match date as timestamp
          $recurlist[$recurkey] = $rdurWsecs; // add duration in seconds
        while( FALSE !== ( $rdate = $component->getProperty( 'rdate' ))) {  // check rdate
          foreach( $rdate as $theRdate ) {
            if( is_array( $theRdate ) && ( 2 == count( $theRdate )) &&  // all days within PERIOD
                   array_key_exists( '0', $theRdate ) &&  array_key_exists( '1', $theRdate )) {
              $rstart = $component->_date2timestamp( $theRdate[0] );
              if(( $rstart < ( $startDate - $rdurWsecs )) || ( $rstart > $endDate ))
                continue;
              if( isset( $theRdate[1]['year'] )) // date-date period
                $rend = $component->_date2timestamp( $theRdate[1] );
              else {                             // date-duration period
                $rend = $component->duration2date( $theRdate[0], $theRdate[1] );
                $rend = $component->_date2timestamp( $rend );
              }
              if((( $startDate - $rdurWsecs ) <= $rstart ) && ( $endDate >= $rstart ))
                $recurlist[$rstart] = ( $rstart - $rend ); // set start date + rdate duration in seconds
            } // PERIOD end
            else { // single date
              $theRdate = $component->_date2timestamp( $theRdate );
              if((( $startDate - $rdurWsecs ) <= $theRdate ) && ( $endDate >= $theRdate ))
                $recurlist[$theRdate] = $rdurWsecs; // set start date + event duration in seconds
            }
          }
        }
        if( 0 < count( $recurlist )) {
          ksort( $recurlist );
          foreach( $recurlist as $recurkey => $durvalue ) {
            if((( $startDate - $rdurWsecs ) > $recurkey ) || ( $endDate < $recurkey )) // not within period
              continue;
            if( isset( $exdatelist[$recurkey] )) // check excluded dates
              continue;
            if( $startWdate >= $recurkey ) // exclude component start date
              continue;
            $component2   = $component->copy();
            $rstart       = $component2->_timestamp2date( $recurkey, 6);
            $datevalue    = $rstart['month'].'/'.$rstart['day'].'/'.$rstart['year'];
            if( isset( $start['hour'] ) || isset( $start['min'] ) || isset( $start['sec'] )) {
              $datevalue .= ( isset( $rstart['hour'] )) ? ' '.$rstart['hour'] : ' 00';
              $datevalue .= ( isset( $rstart['min'] ))  ? ':'.$rstart['min']  : ':00';
              $datevalue .= ( isset( $rstart['sec'] ))  ? ':'.$rstart['sec']  : ':00';
            }
            $datestring = date( $startDateFormat, strtotime( $datevalue ));
            if( isset( $start['tz'] ))
              $datestring .= ' '.$start['tz'];
            $component2->setProperty( 'X-CURRENT-DTSTART', $datestring );
            $rend   = $component2->_timestamp2date(( $recurkey + $durvalue ), 6);
            if( $dtendExist || $dueExist ) {
              if( $endAllDayEvent ) {
                $rend2 = mktime( 0, 0, 0, $rend['month'], ($rend['day'] + 1), $rend['year'] );
                $datevalue  = date( 'm', $rend2 ).'/'.date( 'd', $rend2 ).'/'.date( 'Y', $rend2 );
              }
              else {
                $datevalue  = $rend['month'].'/'.$rend['day'].'/'.$rend['year'];
                if( isset( $end['hour'] ) || isset( $end['min'] ) || isset( $end['sec'] )) {
                  $datevalue .= ( isset( $rend['hour'] )) ? ' '.$rend['hour'] : ' 00';
                  $datevalue .= ( isset( $rend['min'] ))  ? ':'.$rend['min']  : ':00';
                  $datevalue .= ( isset( $rend['sec'] ))  ? ':'.$rend['sec']  : ':00';
                }
              }
              $datestring = date( $endDateFormat, strtotime( $datevalue ));
              if( isset( $end['tz'] ))
                $datestring .= ' '.$end['tz'];
              if( $dtendExist )
                $component2->setProperty( 'X-CURRENT-DTEND', $datestring );
              elseif( $dueExist )
                $component2->setProperty( 'X-CURRENT-DUE', $datestring );
            }
            $rend   = $component2->_date2timestamp( $rend );
            $rstart = $recurkey;
            /* add repeating components within valid dates to output array, only start date */
            if( $flat )
              $result[] = $component2->copy(); // copy to output
            elseif( $split ) {
              if( $rend > $endDate )
                $rend = $endDate;
              while( $rstart <= $rend ) { // iterate
                $wd = getdate( $rstart );
                if(( $rstart > $startDate ) &&      // date after dtstart
                    !isset( $exdatelist[$rstart] )) // check exclude date
                  $result[$wd['year']][$wd['mon']][$wd['mday']][] = $component2->copy(); // copy to output
                $rstart += ( 24*60*60 ); // step one day
              }
            }
            elseif(( $rstart >= $startDate ) &&     // date within period
                  !isset( $exdatelist[$rstart] )) { // check exclude date
              $wd = getdate( $rstart );
              $result[$wd['year']][$wd['mon']][$wd['mday']][] = $component2->copy(); // copy to output
            }
          }
        }
            /* deselect components with startdate/enddate not within period */
        if(( $endWdate < $startDate ) || ( $startWdate > $endDate )) continue;
      }
            /* deselect components with startdate not within period */
      elseif(( $startWdate < $startDate ) || ( $startWdate > $endDate )) continue;
            /* add selected components within valid dates to output array */
      if( $flat )
        $result[] = $component->copy(); // copy to output;
      elseif( $split ) {
        if( $endWdate > $endDate )
          $endWdate = $endDate;     // use period end date
        if( !isset( $exdatelist[$startWdate] ))  { // check excluded dates
          if( $startWdate < $startDate )
            $startWdate = $startDate; // use period start date
          while( $startWdate <= $endWdate ) { // iterate
            $wd = getdate( $startWdate );
            $result[$wd['year']][$wd['mon']][$wd['mday']][] = $component->copy(); // copy to output
            $startWdate += ( 24*60*60 ); // step one day
          }
        }
      } // use component date
      elseif( !isset( $exdatelist[$startWdate] ) &&   // check excluded dates
            ( $startWdate >= $startDate )) {          // within period
        $wd = getdate( $startWdate );
        $result[$wd['year']][$wd['mon']][$wd['mday']][] = $component->copy(); // copy to output
      }
    }
    if( 0 >= count( $result )) return FALSE;
    elseif( !$flat ) {
      foreach( $result as $y => $yeararr ) {
        foreach( $yeararr as $m => $montharr ) {
          ksort( $result[$y][$m] );
        }
        ksort( $result[$y] );
      }
      ksort( $result );
    }
    return $result;
  }
/**
 * add calendar component to container
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.10 - 2008-08-06
 * @param object $component calendar component
 * @param mixed $arg1 optional, ordno/component type/ component uid
 * @param mixed $arg2 optional, ordno if arg1 = component type
 * @return void
 */
  function setComponent( $component, $arg1=FALSE, $arg2=FALSE  ) {
    if( '' >= $component->getConfig( 'language'))
      $component->setConfig( 'language',  $this->getConfig( 'language' ));
    $component->setConfig( 'allowEmpty',  $this->getConfig( 'allowEmpty' ));
    $component->setConfig( 'nl',          $this->getConfig( 'nl' ));
    $component->setConfig( 'unique_id',   $this->getConfig( 'unique_id' ));
    $component->setConfig( 'format',      $this->getConfig( 'format' ));
    if( !in_array( $component->objName, array( 'valarm', 'vtimezone' ))) {
      unset( $component->propix );
            /* make sure dtstamp and uid is set */
      $dummy1 = $component->getProperty( 'dtstamp' );
      $dummy2 = $component->getProperty( 'uid' );
    }
    if( !$arg1 ) {
      $this->components[] = $component->copy();
      return TRUE;
    }
    $argType = $index = null;
    if ( ctype_digit( (string) $arg1 )) {
      $argType = 'INDEX';
      $index   = (int) $arg1 - 1;
    }
    elseif(( strlen( $arg1 ) <= strlen( 'vfreebusy' )) && ( FALSE === strpos( $arg1, '@' ))) {
      $argType = strtolower( $arg1 );
      $index = ( ctype_digit( (string) $arg2 )) ? ((int) $arg2) - 1 : 0;
    }
    $cix1sC = 0;
    foreach ( $this->components as $cix => $component2) {
      if( empty( $component2 )) continue;
      unset( $component2->propix );
      if(( 'INDEX' == $argType ) && ( $index == $cix )) {
        $this->components[$cix] = $component->copy();
        return TRUE;
      }
      elseif( $argType == $component2->objName ) {
        if( $index == $cix1sC ) {
          $this->components[$cix] = $component->copy();
          return TRUE;
        }
        $cix1sC++;
      }
      elseif( !$argType && ( $arg1 == $component2->getProperty( 'uid' ))) {
        $this->components[$cix] = $component->copy();
        return TRUE;
      }
    }
            /* not found.. . insert last in chain anyway .. .*/
    $this->components[] = $component->copy();
    return TRUE;
  }
/**
 * sort iCal compoments, only local date sort
 *
 * ascending sort on properties (if exist) x-current-dtstart, dtstart,
 * x-current-dtend, dtend, x-current-due, due, duration, created, dtstamp, uid
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.10 - 2008-09-24
 * @return sort param
 *
 */
  function sort() {
    if( is_array( $this->components )) {
      $this->_sortkeys = array( 'year', 'month', 'day', 'hour', 'min', 'sec' );
      usort( $this->components, array( $this, '_cmpfcn' ));
    }
  }
  function _cmpfcn( $a, $b ) {
    if( empty( $a ))                                   return -1;
    if( empty( $b ))                                   return  1;
    if(  'vtimezone' == $a->objName)                   return -1;
    if(  'vtimezone' == $b->objName)                   return  1;
    $astart = ( isset( $a->xprop['X-CURRENT-DTSTART']['value'] )) ? $a->_date_time_string( $a->xprop['X-CURRENT-DTSTART']['value'] ) : null;
    if( empty( $astart ) && isset( $a->dtstart['value'] ))
      $astart = & $a->dtstart['value'];
    $bstart = ( isset( $b->xprop['X-CURRENT-DTSTART']['value'] )) ? $b->_date_time_string( $b->xprop['X-CURRENT-DTSTART']['value'] ) : null;
    if( empty( $bstart ) && isset( $b->dtstart['value'] ))
      $bstart = & $b->dtstart['value'];
    if(     empty( $astart ))                          return -1;
    elseif( empty( $bstart ))                          return  1;
    foreach( $this->_sortkeys as $key ) {
      if    ( empty( $astart[$key] ))                  return -1;
      elseif( empty( $bstart[$key] ))                  return  1;
      if    (        $astart[$key] == $bstart[$key])   continue;
      if    (( (int) $astart[$key] ) < ((int) $bstart[$key] ))
                                                       return -1;
      elseif(( (int) $astart[$key] ) > ((int) $bstart[$key] ))
                                                       return  1;
    }
    $c   = ( isset( $a->xprop['X-CURRENT-DTEND']['value'] )) ? $a->_date_time_string( $a->xprop['X-CURRENT-DTEND']['value'] ) : null;
    if(     empty( $c ) && !empty( $a->dtend['value'] ))
      $c = & $a->dtend['value'];
    if(     empty( $c ) && isset( $a->xprop['X-CURRENT-DUE']['value'] ))
      $c = $a->_date_time_string( $a->xprop['X-CURRENT-DUE']['value'] );
    if(     empty( $c ) && !empty( $a->due['value'] ))
      $c = & $a->due['value'];
    if(     empty( $c ) && !empty( $a->duration['value'] ))
      $c = $a->duration2date();
    $d   = ( isset( $b->xprop['X-CURRENT-DTEND']['value'] )) ? $b->_date_time_string( $b->xprop['X-CURRENT-DTEND']['value'] ) : null;
    if(     empty( $d ) && !empty( $b->dtend['value'] ))
      $d = & $b->dtend['value'];
    if(     empty( $d ) && isset( $b->xprop['X-CURRENT-DUE']['value'] ))
      $d = $b->_date_time_string( $b->xprop['X-CURRENT-DUE']['value'] );
    if(     empty( $d ) && !empty( $b->due['value'] ))
      $d = & $b->due['value'];
    if(     empty( $d ) && !empty( $b->duration['value'] ))
      $d = $b->duration2date();
    if(     empty( $c ))                               return -1;
    elseif( empty( $d ))                               return  1;
    foreach( $this->_sortkeys as $key ) {
      if    ( !isset( $c[$key] ))                      return -1;
      elseif( !isset( $d[$key] ))                      return  1;
      if    (         $c[$key] == $d[$key] )           continue;
      if    ((  (int) $c[$key] ) < ((int) $d[$key]))   return -1;
      elseif((  (int) $c[$key] ) > ((int) $d[$key]))   return  1;
    }
    if( isset( $a->created['value'] ))
     $e = & $a->created['value'];
    else
     $e = & $a->dtstamp['value'];
    if( isset( $b->created['value'] ))
      $f = & $b->created['value'];
    else
      $f = & $b->dtstamp['value'];
    foreach( $this->_sortkeys as $key ) {
      if(       !isset( $e[$key] ))                    return -1;
      elseif(   !isset( $f[$key] ))                    return  1;
      if    (           $e[$key] == $f[$key] )         continue;
      if    ((    (int) $e[$key] ) < ((int) $f[$key])) return -1;
      elseif((    (int) $e[$key] ) > ((int) $f[$key])) return  1;
    }
    if    ((            $a->uid['value'] ) <
           (            $b->uid['value'] ))            return -1;
    elseif((            $a->uid['value'] ) >
           (            $b->uid['value'] ))            return  1;
    return 0;
  }
/**
 * parse iCal file into vcalendar, components, properties and parameters
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.10 - 2008-08-06
 * @param string $filename optional filname (incl. opt. directory/path) or URL
 * @return bool FALSE if error occurs during parsing
 *
 */
  function parse( $filename=FALSE ) {
    if( !$filename ) {
            /* directory/filename previous set via setConfig directory+filename / url */
      if( FALSE === ( $filename = $this->getConfig( 'url' )))
        $filename = $this->getConfig( 'dirfile' );
    }
    elseif(( 'http://'   == strtolower( substr( $filename, 0, 7 ))) ||
           ( 'webcal://' == strtolower( substr( $filename, 0, 9 ))))  {
            /* remote file - URL */
      $this->setConfig( 'URL', $filename );
      if( !$filename = $this->getConfig( 'url' ))
        return FALSE;                 /* err 2 */
    }
    else {
            /* local directory/filename */
      $parts = pathinfo( $filename );
      if( !empty( $parts['dirname'] ) && ( '.' != $parts['dirname'] )) {
        if( !$this->setConfig( 'directory', $parts['dirname'] ))
          return FALSE;               /* err 3 */
      }
      if( !$this->setConfig( 'filename', $parts['basename'] ))
        return FALSE;                 /* err 4 */
    }
    if( 'http://' != substr( $filename, 0, 7 )) {
            /* local file error tests */
      if( !is_file( $filename ))      /* err 5 */
        return FALSE;
      if( !is_readable( $filename ))
        return FALSE;                 /* err 6 */
      if( !filesize( $filename ))
        return FALSE;                 /* err 7 */
      clearstatcache();
    }
            /* READ FILE */
    if( FALSE === ( $rows = file( $filename )))
      return FALSE;                   /* err 1 */
            /* identify BEGIN:VCALENDAR, MUST be first row */
    if( 'BEGIN:VCALENDAR' != strtoupper( trim( $rows[0] )))
      return FALSE;                   /* err 8 */
            /* remove empty trailing lines */
    while( '' == trim( $rows[count( $rows ) - 1] )) {
      unset( $rows[count( $rows ) - 1] );
      $rows  = array_values( $rows );
    }
            /* identify ending END:VCALENDAR row */
    if( 'END:VCALENDAR'   != strtoupper( trim( $rows[count( $rows ) - 1] ))) {
      return FALSE;                   /* err 9 */
    }
    if( 3 > count( $rows ))
      return FALSE;                   /* err 10 */
    $comp    = $subcomp = null;
    $actcomp = & $this;
    $nl      = $this->getConfig( 'nl' );
    $calsync = 0;
            /* identify components and update unparsed data within component */
    foreach( $rows as $line ) {
      if( '' == trim( $line ))
        continue;
      if( $nl == substr( $line, 0 - strlen( $nl )))
        $line = substr( $line, 0, ( strlen( $line ) - strlen( $nl ))).'\n';
      if( 'BEGIN:VCALENDAR' == strtoupper( substr( $line, 0, 15 ))) {
        $calsync++;
        continue;
      }
      elseif( 'END:VCALENDAR' == strtoupper( substr( $line, 0, 13 ))) {
        $calsync--;
        continue;
      }
      elseif( 1 != $calsync )
        return FALSE;                 /* err 20 */
      if( 'END:' == strtoupper( substr( $line, 0, 4 ))) {
        if( null != $subcomp ) {
          $comp->setComponent( $subcomp );
          $subcomp = null;
        }
        else {
          $this->setComponent( $comp );
          $comp = null;
        }
        $actcomp = null;
        continue;
      } // end - if ( 'END:' ==.. .
      elseif( 'BEGIN:' == strtoupper( substr( $line, 0, 6 ))) {
        $line = str_replace( '\n', '', $line );
        $compname = trim (strtoupper( substr( $line, 6 )));
        if( null != $comp ) {
          if( 'VALARM' == $compname )
            $subcomp = new valarm();
          elseif( 'STANDARD' == $compname )
            $subcomp = new vtimezone( 'STANDARD' );
          elseif( 'DAYLIGHT' == $compname )
            $subcomp = new vtimezone( 'DAYLIGHT' );
          else
            return FALSE; /* err 6 */
          $actcomp = & $subcomp;
        }
        else {
          switch( $compname ) {
            case 'VALARM':
              $comp = new valarm();
              break;
            case 'VEVENT':
              $comp = new vevent();
              break;
            case 'VFREEBUSY';
              $comp = new vfreebusy();
              break;
            case 'VJOURNAL':
              $comp = new vjournal();
              break;
            case 'VTODO':
              $comp = new vtodo();
              break;
            case 'VTIMEZONE':
              $comp = new vtimezone();
              break;
            default:
              return FALSE; // err 7
              break;
          } // end - switch
          $actcomp = & $comp;
        }
        continue;
      } // end - elsif ( 'BEGIN:'.. .
            /* update selected component with unparsed data */
      $actcomp->unparsed[] = $line;
    } // end - foreach( rows.. .
            /* parse data for calendar (this) object */
    if( is_array( $this->unparsed ) && ( 0 < count( $this->unparsed ))) {
            /* concatenate property values spread over several lines */
      $lastix    = -1;
      $propnames = array( 'calscale','method','prodid','version','x-' );
      $proprows  = array();
      foreach( $this->unparsed as $line ) {
        $newProp = FALSE;
        foreach ( $propnames as $propname ) {
          if( $propname == strtolower( substr( $line, 0, strlen( $propname )))) {
            $newProp = TRUE;
            break;
          }
        }
        if( $newProp ) {
          $newProp = FALSE;
          $lastix++;
          $proprows[$lastix]  = $line;
        }
        else {
            /* remove line breaks */
          if(( '\n' == substr( $proprows[$lastix], -2 )) &&
             (  ' ' == substr( $line, 0, 1 ))) {
            $proprows[$lastix] = substr( $proprows[$lastix], 0, strlen( $proprows[$lastix] ) - 2 );
            $line = substr( $line, 1 );
          }
          $proprows[$lastix] .= $line;
        }
      }
      $toolbox = new calendarComponent();
      foreach( $proprows as $line ) {
        if( '\n' == substr( $line, -2 ))
          $line = substr( $line, 0, strlen( $line ) - 2 );
            /* get propname */
        $cix = $propname = null;
        for( $cix=0; $cix < strlen( $line ); $cix++ ) {
          if( in_array( $line{$cix}, array( ':', ';' )))
            break;
          else
            $propname .= $line{$cix};
        }
            /* ignore version/prodid properties */
        if( in_array( strtoupper( $propname ), array( 'VERSION', 'PRODID' )))
          continue;
        $line = substr( $line, $cix);
            /* separate attributes from value */
        $attr   = array();
        $attrix = -1;
        $strlen = strlen( $line );
        for( $cix=0; $cix < $strlen; $cix++ ) {
          if((       ':'   == $line{$cix} )             &&
                   ( '://' != substr( $line, $cix, 3 )) &&
             ( 'mailto:'   != strtolower( substr( $line, $cix - 6, 7 )))) {
            $attrEnd = TRUE;
            if(( $cix < ( $strlen - 4 )) &&
                 ctype_digit( substr( $line, $cix+1, 4 ))) { // an URI with a (4pos) portnr??
              for( $c2ix = $cix; 3 < $c2ix; $c2ix-- ) {
                if( '://' == substr( $line, $c2ix - 2, 3 )) {
                  $attrEnd = FALSE;
                  break; // an URI with a portnr!!
                }
              }
            }
            if( $attrEnd) {
              $line = substr( $line, $cix + 1 );
              break;
            }
          }
          if( ';' == $line{$cix} )
            $attr[++$attrix] = null;
          else
            $attr[$attrix] .= $line{$cix};
        }

            /* make attributes in array format */
        $propattr = array();
        foreach( $attr as $attribute ) {
          $attrsplit = explode( '=', $attribute, 2 );
          if( 1 < count( $attrsplit ))
            $propattr[$attrsplit[0]] = $attrsplit[1];
          else
            $propattr[] = $attribute;
        }
            /* update Property */
        if( FALSE !== strpos( $line, ',' )) {
          $content  = explode( ',', $line );
          $clen     = count( $content );
          for( $cix = 0; $cix < $clen; $cix++ ) {
            if( "\\" == substr( $content[$cix], -1 )) {
              $content[$cix] .= ','.$content[$cix + 1];
              unset( $content[$cix + 1] );
              $cix++;
            }
          }
          if( 1 < count( $content )) {
            foreach( $content as $cix => $contentPart )
              $content[$cix] = $toolbox->_strunrep( $contentPart );
            $this->setProperty( $propname, $content, $propattr );
            continue;
          }
          else
            $line = reset( $content );
          $line = $toolbox->_strunrep( $line );
        }
        $this->setProperty( $propname, trim( $line ), $propattr );
      } // end - foreach( $this->unparsed.. .
    } // end - if( is_array( $this->unparsed.. .
            /* parse Components */
    if( is_array( $this->components ) && ( 0 < count( $this->components ))) {
      for( $six = 0; $six < count( $this->components ); $six++ ) {
        if( !empty( $this->components[$six] ))
          $this->components[$six]->parse();
      }
    }
    else
      return FALSE;                   /* err 91 or something.. . */
    return TRUE;
  }
/*********************************************************************************/
/**
 * creates formatted output for calendar object instance
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.10 - 2008-08-06
 * @return string
 */
  function createCalendar() {
    $calendarInit1 = $calendarInit2 = $calendarxCaldecl = $calendarStart = $calendar = null;
    switch( $this->format ) {
      case 'xcal':
        $calendarInit1 = '<?xml version="1.0" encoding="UTF-8"?>'.$this->nl.
                         '<!DOCTYPE iCalendar PUBLIC "-//IETF//DTD XCAL/iCalendar XML//EN"'.$this->nl.
                         '"http://www.ietf.org/internet-drafts/draft-ietf-calsch-many-xcal-01.txt"';
        $calendarInit2 = '>'.$this->nl;
        $calendarStart = '<vcalendar';
        break;
      default:
        $calendarStart = 'BEGIN:VCALENDAR'.$this->nl;
        break;
    }
    $calendarStart .= $this->createCalscale();
    $calendarStart .= $this->createMethod();
    $calendarStart .= $this->createProdid();
    $calendarStart .= $this->createVersion();
    switch( $this->format ) {
      case 'xcal':
        $nlstrlen = strlen( $this->nl );
        if( $this->nl == substr( $calendarStart, ( 0 - $nlstrlen )))
          $calendarStart = substr( $calendarStart, 0, ( strlen( $calendarStart ) - $nlstrlen ));
        $calendarStart .= '>'.$this->nl;
        break;
      default:
        break;
    }
    $calendar .= $this->createXprop();
    foreach( $this->components as $component ) {
      if( empty( $component )) continue;
      if( '' >= $component->getConfig( 'language'))
        $component->setConfig( 'language',  $this->getConfig( 'language' ));
      $component->setConfig( 'allowEmpty',  $this->getConfig( 'allowEmpty' ));
      $component->setConfig( 'nl',          $this->getConfig( 'nl' ));
      $component->setConfig( 'unique_id',   $this->getConfig( 'unique_id' ));
      $component->setConfig( 'format',      $this->getConfig( 'format' ));
      $calendar .= $component->createComponent( $this->xcaldecl );
    }
    if(( 0 < count( $this->xcaldecl )) && ( 'xcal' == $this->format )) { // xCal only
      $calendarInit1 .= $this->nl.'['.$this->nl;
      $old_xcaldecl = array();
      foreach( $this->xcaldecl as $declix => $declPart ) {
        if(( 0 < count( $old_xcaldecl)) &&
           ( in_array( $declPart['uri'],      $old_xcaldecl['uri'] )) &&
           ( in_array( $declPart['external'], $old_xcaldecl['external'] )))
          continue; // no duplicate uri and ext. references
        $calendarxCaldecl .= '<!';
        foreach( $declPart as $declKey => $declValue ) {
          switch( $declKey ) {                    // index
            case 'xmldecl':                       // no 1
              $calendarxCaldecl .= $declValue.' ';
              break;
            case 'uri':                           // no 2
              $calendarxCaldecl .= $declValue.' ';
              $old_xcaldecl['uri'][] = $declValue;
              break;
            case 'ref':                           // no 3
              $calendarxCaldecl .= $declValue.' ';
              break;
            case 'external':                      // no 4
              $calendarxCaldecl .= '"'.$declValue.'" ';
              $old_xcaldecl['external'][] = $declValue;
              break;
            case 'type':                          // no 5
              $calendarxCaldecl .= $declValue.' ';
              break;
            case 'type2':                         // no 6
              $calendarxCaldecl .= $declValue;
              break;
          }
        }
        $calendarxCaldecl .= '>'.$this->nl;
      }
      $calendarInit2 = ']'.$calendarInit2;
    }
    switch( $this->format ) {
      case 'xcal':
        $calendar .= '</vcalendar>'.$this->nl;
        break;
      default:
        $calendar .= 'END:VCALENDAR'.$this->nl;
        break;
    }
    return $calendarInit1.$calendarxCaldecl.$calendarInit2.$calendarStart.$calendar;
  }
/**
 * a HTTP redirect header is sent with created, updated and/or parsed calendar
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.12 - 2007-10-23
 * @return redirect
 */
  function returnCalendar() {
    $filename = $this->getConfig( 'filename' );
    $output   = $this->createCalendar();
    $filesize = strlen( $output );
//    if( headers_sent( $filename, $linenum ))
//      die( "Headers already sent in $filename on line $linenum\n" );
    if( 'xcal' == $this->format )
      header( 'Content-Type: application/calendar+xml; charset=utf-8' );
    else
      header( 'Content-Type: text/calendar; charset=utf-8' );
    header( 'Content-Length: '.$filesize );
    header( 'Content-Disposition: attachment; filename="'.$filename.'"' );
    header( 'Cache-Control: max-age=10' );
    echo $output;
    die();
  }
/**
 * save content in a file
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.12 - 2007-12-30
 * @param string $directory optional
 * @param string $filename optional
 * @param string $delimiter optional
 * @return bool
 */
  function saveCalendar( $directory=FALSE, $filename=FALSE, $delimiter=FALSE ) {
    if( $directory )
      $this->setConfig( 'directory', $directory );
    if( $filename )
      $this->setConfig( 'filename',  $filename );
    if( $delimiter && ($delimiter != DIRECTORY_SEPARATOR ))
      $this->setConfig( 'delimiter', $delimiter );
    if( FALSE === ( $dirfile = $this->getConfig( 'url' )))
      $dirfile = $this->getConfig( 'dirfile' );
    $iCalFile = @fopen( $dirfile, 'w' );
    if( $iCalFile ) {
      if( FALSE === fwrite( $iCalFile, $this->createCalendar() ))
        return FALSE;
      fclose( $iCalFile );
      return TRUE;
    }
    else
      return FALSE;
  }
/**
 * if recent version of calendar file exists (default one hour), an HTTP redirect header is sent
 * else FALSE is returned
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.12 - 2007-10-28
 * @param string $directory optional alt. int timeout
 * @param string $filename optional
 * @param string $delimiter optional
 * @param int timeout optional, default 3600 sec
 * @return redirect/FALSE
 */
  function useCachedCalendar( $directory=FALSE, $filename=FALSE, $delimiter=FALSE, $timeout=3600) {
    if ( $directory && ctype_digit( (string) $directory ) && !$filename ) {
      $timeout   = (int) $directory;
      $directory = FALSE;
    }
    if( $directory )
      $this->setConfig( 'directory', $directory );
    if( $filename )
      $this->setConfig( 'filename',  $filename );
    if( $delimiter && ( $delimiter != DIRECTORY_SEPARATOR ))
      $this->setConfig( 'delimiter', $delimiter );
    $filesize    = $this->getConfig( 'filesize' );
    if( 0 >= $filesize )
      return FALSE;
    $dirfile     = $this->getConfig( 'dirfile' );
    if( time() - filemtime( $dirfile ) < $timeout) {
      clearstatcache();
      $dirfile   = $this->getConfig( 'dirfile' );
      $filename  = $this->getConfig( 'filename' );
//    if( headers_sent( $filename, $linenum ))
//      die( "Headers already sent in $filename on line $linenum\n" );
      if( 'xcal' == $this->format )
        header( 'Content-Type: application/calendar+xml; charset=utf-8' );
      else
        header( 'Content-Type: text/calendar; charset=utf-8' );
      header( 'Content-Length: '.$filesize );
      header( 'Content-Disposition: attachment; filename="'.$filename.'"' );
      header( 'Cache-Control: max-age=10' );
      $fp = @$fopen( $dirfile, 'r' );
      if( $fp ) {
        fpassthru( $fp );
        fclose( $fp );
      }
      die();
    }
    else
      return FALSE;
  }
}
/*********************************************************************************/
/*********************************************************************************/
/**
 *  abstract class for calendar components
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.19 - 2008-10-12
 */
class calendarComponent {
            //  component property variables
  var $uid;
  var $dtstamp;

            //  component config variables
  var $allowEmpty;
  var $language;
  var $nl;
  var $unique_id;
  var $format;
  var $objName; // created automatically at instance creation
            //  component internal variables
  var $componentStart1;
  var $componentStart2;
  var $componentEnd1;
  var $componentEnd2;
  var $elementStart1;
  var $elementStart2;
  var $elementEnd1;
  var $elementEnd2;
  var $intAttrDelimiter;
  var $attributeDelimiter;
  var $valueInit;
            //  component xCal declaration container
  var $xcaldecl;
/**
 * constructor for calendar component object
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.19 - 2008-10-23
 */
  function calendarComponent() {
    $this->objName         = ( isset( $this->timezonetype )) ?
                          strtolower( $this->timezonetype )  :  get_class ( $this );
    $this->uid             = array();
    $this->dtstamp         = array();

    $this->language        = null;
    $this->nl              = null;
    $this->unique_id       = null;
    $this->format          = null;
    $this->allowEmpty      = TRUE;
    $this->xcaldecl        = array();

    $this->_createFormat();
    $this->_makeDtstamp();
  }
/*********************************************************************************/
/**
 * Property Name: ACTION
 */
/**
 * creates formatted output for calendar component property action
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createAction() {
    if( empty( $this->action )) return FALSE;
    if( empty( $this->action['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'ACTION' ) : FALSE;
    $attributes = $this->_createParams( $this->action['params'] );
    return $this->_createElement( 'ACTION', $attributes, $this->action['value'] );
  }
/**
 * set calendar component property action
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value  "AUDIO" / "DISPLAY" / "EMAIL" / "PROCEDURE"
 * @param mixed $params
 * @return bool
 */
  function setAction( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->action = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: ATTACH
 */
/**
 * creates formatted output for calendar component property attach
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-23
 * @return string
 */
  function createAttach() {
    if( empty( $this->attach )) return FALSE;
    $output       = null;
    foreach( $this->attach as $attachPart ) {
      if(! empty( $attachPart['value'] )) {
        $attributes = $this->_createParams( $attachPart['params'] );
        $output    .= $this->_createElement( 'ATTACH', $attributes, $attachPart['value'] );
      }
      elseif( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'ATTACH' );
    }
    return $output;
  }
/**
 * set calendar component property attach
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-06
 * @param string $value
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setAttach( $value, $params=FALSE, $index=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->_setMval( $this->attach, $value, $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: ATTENDEE
 */
/**
 * creates formatted output for calendar component property attendee
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-09-23
 * @return string
 */
  function createAttendee() {
    if( empty( $this->attendee )) return FALSE;
    $output = null;
    foreach( $this->attendee as $attendeePart ) {                      // start foreach 1
      if( empty( $attendeePart['value'] )) {
        if( $this->getConfig( 'allowEmpty' ))
          $output .= $this->_createElement( 'ATTENDEE' );
        continue;
      }
      $attendee1 = $attendee2 = $attendeeLANG = $attendeeCN = null;
      foreach( $attendeePart as $paramlabel => $paramvalue ) {         // start foreach 2
        if( 'value' == $paramlabel )
          $attendee2  .= 'MAILTO:'.$paramvalue;
        elseif(( 'params' == $paramlabel ) && ( is_array( $paramvalue ))) { // start elseif
          foreach( $paramvalue as $optparamlabel => $optparamvalue ) { // start foreach 3
            $attendee11 = $attendee12 = null;
            if( is_int( $optparamlabel )) {
              $attendee1 .= $this->intAttrDelimiter.$optparamvalue;
              continue;
            }
            switch( $optparamlabel ) {                                 // start switch
              case 'CUTYPE':
              case 'PARTSTAT':
              case 'ROLE':
              case 'RSVP':
                $attendee1 .= $this->intAttrDelimiter.$optparamlabel.'="'.$optparamvalue.'"';
                break;
              case 'SENT-BY':
                $attendee1 .= $this->intAttrDelimiter.'SENT-BY="MAILTO:'.$optparamvalue.'"';
                break;
              case 'MEMBER':
                $attendee11 = $this->intAttrDelimiter.'MEMBER=';
              case 'DELEGATED-TO':
                $attendee11 = ( !$attendee11 ) ? $this->intAttrDelimiter.'DELEGATED-TO='   : $attendee11;
              case 'DELEGATED-FROM':
                $attendee11 = ( !$attendee11 ) ? $this->intAttrDelimiter.'DELEGATED-FROM=' : $attendee11;
                foreach( $optparamvalue  as $cix => $calUserAddress ) {
                  $attendee12 .= ( $cix ) ? ',' : null;
                  $attendee12 .= '"MAILTO:'.$calUserAddress.'"';
                }
                $attendee1  .= $attendee11.$attendee12;
                break;
              case 'CN':
                $attendeeCN .= $this->intAttrDelimiter.'CN="'.$optparamvalue.'"';
                break;
              case 'DIR':
                $attendee1 .= $this->intAttrDelimiter.'DIR="'.$optparamvalue.'"';
                break;
              case 'LANGUAGE':
                $attendeeLANG .= $this->intAttrDelimiter.'LANGUAGE='.$optparamvalue;
                break;
              default:
                $attendee1 .= $this->intAttrDelimiter."$optparamlabel=$optparamvalue";
                break;
            }    // end switch
          }      // end foreach 3
        }        // end elseif
      }          // end foreach 2
      $output .= $this->_createElement( 'ATTENDEE', $attendee1.$attendeeLANG.$attendeeCN, $attendee2 );
    }              // end foreach 1
    return $output;
  }
/**
 * set calendar component property attach
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param string $value
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setAttendee( $value, $params=FALSE, $index=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $value = str_replace ( 'MAILTO:', '', $value );
    $value = str_replace ( 'mailto:', '', $value );
    $params2 = array();
    if( is_array($params )) {
      $optarrays = array();
      foreach( $params as $optparamlabel => $optparamvalue ) {
        $optparamlabel = strtoupper( $optparamlabel );
        switch( $optparamlabel ) {
          case 'MEMBER':
          case 'DELEGATED-TO':
          case 'DELEGATED-FROM':
            if( is_array( $optparamvalue )) {
              foreach( $optparamvalue as $part ) {
                $part = str_replace( 'MAILTO:', '', $part );
                $part = str_replace( 'mailto:', '', $part );
                if(( '"' == $part{0} ) && ( '"' == $part{strlen($part)-1} ))
                  $part = substr( $part, 1, ( strlen($part)-2 ));
                $optarrays[$optparamlabel][] = $part;
              }
            }
            else {
              $part = str_replace( 'MAILTO:', '', $optparamvalue );
              $part = str_replace( 'mailto:', '', $part );
              if(( '"' == $part{0} ) && ( '"' == $part{strlen($part)-1} ))
                $part = substr( $part, 1, ( strlen($part)-2 ));
              $optarrays[$optparamlabel][] = $part;
            }
            break;
          default:
            if( 'SENT-BY' ==  $optparamlabel ) {
              $optparamvalue = str_replace( 'MAILTO:', '', $optparamvalue );
              $optparamvalue = str_replace( 'mailto:', '', $optparamvalue );
            }
            if(( '"' == substr( $optparamvalue, 0, 1 )) &&
               ( '"' == substr( $optparamvalue, -1 )))
              $optparamvalue = substr( $optparamvalue, 1, ( strlen( $optparamvalue ) - 2 ));
            $params2[$optparamlabel] = $optparamvalue;
            break;
        } // end switch( $optparamlabel.. .
      } // end foreach( $optparam.. .
      foreach( $optarrays as $optparamlabel => $optparams )
        $params2[$optparamlabel] = $optparams;
    }
        // remove defaults
    $this->_existRem( $params2, 'CUTYPE',   'INDIVIDUAL' );
    $this->_existRem( $params2, 'PARTSTAT', 'NEEDS-ACTION' );
    $this->_existRem( $params2, 'ROLE',     'REQ-PARTICIPANT' );
    $this->_existRem( $params2, 'RSVP',     'FALSE' );
        // check language setting
    if( isset( $params2['CN' ] )) {
      $lang = $this->getConfig( 'language' );
      if( !isset( $params2['LANGUAGE' ] ) && !empty( $lang ))
        $params2['LANGUAGE' ] = $lang;
    }
    $this->_setMval( $this->attendee, $value, $params2, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: CATEGORIES
 */
/**
 * creates formatted output for calendar component property categories
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createCategories() {
    if( empty( $this->categories )) return FALSE;
    $output = null;
    foreach( $this->categories as $category ) {
      if( empty( $category['value'] )) {
        if ( $this->getConfig( 'allowEmpty' ))
          $output .= $this->_createElement( 'CATEGORIES' );
        continue;
      }
      $attributes = $this->_createParams( $category['params'], array( 'LANGUAGE' ));
      if( is_array( $category['value'] )) {
        foreach( $category['value'] as $cix => $categoryPart )
          $category['value'][$cix] = $this->_strrep( $categoryPart );
        $content  = implode( ',', $category['value'] );
      }
      else
        $content  = $this->_strrep( $category['value'] );
      $output    .= $this->_createElement( 'CATEGORIES', $attributes, $content );
    }
    return $output;
  }
/**
 * set calendar component property categories
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-06
 * @param mixed $value
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setCategories( $value, $params=FALSE, $index=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->_setMval( $this->categories, $value, $params, FALSE, $index );
    return TRUE;
 }
/*********************************************************************************/
/**
 * Property Name: CLASS
 */
/**
 * creates formatted output for calendar component property class
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-20
 * @return string
 */
  function createClass() {
    if( empty( $this->class )) return FALSE;
    if( empty( $this->class['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'CLASS' ) : FALSE;
    $attributes = $this->_createParams( $this->class['params'] );
    return $this->_createElement( 'CLASS', $attributes, $this->class['value'] );
  }
/**
 * set calendar component property class
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value "PUBLIC" / "PRIVATE" / "CONFIDENTIAL" / iana-token / x-name
 * @param array $params optional
 * @return bool
 */
  function setClass( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->class = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: COMMENT
 */
/**
 * creates formatted output for calendar component property comment
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createComment() {
    if( empty( $this->comment )) return FALSE;
    $output = null;
    foreach( $this->comment as $commentPart ) {
      if( empty( $commentPart['value'] )) {
        if( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'COMMENT' );
        continue;
      }
      $attributes = $this->_createParams( $commentPart['params'], array( 'ALTREP', 'LANGUAGE' ));
      $content    = $this->_strrep( $commentPart['value'] );
      $output    .= $this->_createElement( 'COMMENT', $attributes, $content );
    }
    return $output;
  }
/**
 * set calendar component property comment
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-06
 * @param string $value
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setComment( $value, $params=FALSE, $index=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->_setMval( $this->comment, $value, $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: COMPLETED
 */
/**
 * creates formatted output for calendar component property completed
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createCompleted( ) {
    if( empty( $this->completed )) return FALSE;
    if( !isset( $this->completed['value']['year'] )  &&
        !isset( $this->completed['value']['month'] ) &&
        !isset( $this->completed['value']['day'] )   &&
        !isset( $this->completed['value']['hour'] )  &&
        !isset( $this->completed['value']['min'] )   &&
        !isset( $this->completed['value']['sec'] ))
      if( $this->getConfig( 'allowEmpty' ))
        return $this->_createElement( 'COMPLETED' );
      else return FALSE;
    $formatted  = $this->_format_date_time( $this->completed['value'], 7 );
    $attributes = $this->_createParams( $this->completed['params'] );
    return $this->_createElement( 'COMPLETED', $attributes, $formatted );
  }
/**
 * set calendar component property completed
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @param mixed $year
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param array $params optional
 * @return bool
 */
  function setCompleted( $year, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $params=FALSE ) {
    if( empty( $year )) {
      if( $this->getConfig( 'allowEmpty' )) {
        $this->completed = array( 'value' => null, 'params' => $this->_setParams( $params ));
        return TRUE;
      }
      else
        return FALSE;
    }
    $this->completed = $this->_setDate2( $year, $month, $day, $hour, $min, $sec, $params );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: CONTACT
 */
/**
 * creates formatted output for calendar component property contact
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @return string
 */
  function createContact() {
    if( empty( $this->contact )) return FALSE;
    $output = null;
    foreach( $this->contact as $contact ) {
      if( !empty( $contact['value'] )) {
        $attributes = $this->_createParams( $contact['params'], array( 'ALTREP', 'LANGUAGE' ));
        $content    = $this->_strrep( $contact['value'] );
        $output    .= $this->_createElement( 'CONTACT', $attributes, $content );
      }
      elseif( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'CONTACT' );
    }
    return $output;
  }
/**
 * set calendar component property contact
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param string $value
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setContact( $value, $params=FALSE, $index=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->_setMval( $this->contact, $value, $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: CREATED
 */
/**
 * creates formatted output for calendar component property created
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createCreated() {
    if( empty( $this->created )) return FALSE;
    $formatted  = $this->_format_date_time( $this->created['value'], 7 );
    $attributes = $this->_createParams( $this->created['params'] );
    return $this->_createElement( 'CREATED', $attributes, $formatted );
  }
/**
 * set calendar component property created
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @param mixed $year optional
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param mixed $params optional
 * @return bool
 */
  function setCreated( $year=FALSE, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $params=FALSE ) {
    if( !isset( $year )) {
      $year = date('Ymd\THis', mktime( date( 'H' ), date( 'i' ), date( 's' ) - date( 'Z'), date( 'm' ), date( 'd' ), date( 'Y' )));
    }
    $this->created = $this->_setDate2( $year, $month, $day, $hour, $min, $sec, $params );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: DESCRIPTION
 */
/**
 * creates formatted output for calendar component property description
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createDescription() {
    if( empty( $this->description )) return FALSE;
    $output       = null;
    foreach( $this->description as $description ) {
      if( !empty( $description['value'] )) {
        $attributes = $this->_createParams( $description['params'], array( 'ALTREP', 'LANGUAGE' ));
        $content    = $this->_strrep( $description['value'] );
        $output    .= $this->_createElement( 'DESCRIPTION', $attributes, $content );
      }
      elseif( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'DESCRIPTION' );
    }
    return $output;
  }
/**
 * set calendar component property description
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param string $value
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setDescription( $value, $params=FALSE, $index=FALSE ) {
    if( empty( $value )) { if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE; }
    $this->_setMval( $this->description, $value, $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: DTEND
 */
/**
 * creates formatted output for calendar component property dtend
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createDtend() {
    if( empty( $this->dtend )) return FALSE;
    if( !isset( $this->dtend['value']['year'] )  &&
        !isset( $this->dtend['value']['month'] ) &&
        !isset( $this->dtend['value']['day'] )   &&
        !isset( $this->dtend['value']['hour'] )  &&
        !isset( $this->dtend['value']['min'] )   &&
        !isset( $this->dtend['value']['sec'] ))
      if( $this->getConfig( 'allowEmpty' ))
        return $this->_createElement( 'DTEND' );
      else return FALSE;
    $formatted  = $this->_format_date_time( $this->dtend['value'] );
    $attributes = $this->_createParams( $this->dtend['params'] );
    return $this->_createElement( 'DTEND', $attributes, $formatted );
  }
/**
 * set calendar component property dtend
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @param mixed $year
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param string $tz optional
 * @param array params optional
 * @return bool
 */
  function setDtend( $year, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $tz=FALSE, $params=FALSE ) {
    if( empty( $year )) {
      if( $this->getConfig( 'allowEmpty' )) {
        $this->dtend = array( 'value' => null, 'params' => $this->_setParams( $params ));
        return TRUE;
      }
      else
        return FALSE;
    }
    $this->dtend = $this->_setDate( $year, $month, $day, $hour, $min, $sec, $tz, $params );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: DTSTAMP
 */
/**
 * creates formatted output for calendar component property dtstamp
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.4 - 2008-03-07
 * @return string
 */
  function createDtstamp() {
    if( !isset( $this->dtstamp['value']['year'] )  &&
        !isset( $this->dtstamp['value']['month'] ) &&
        !isset( $this->dtstamp['value']['day'] )   &&
        !isset( $this->dtstamp['value']['hour'] )  &&
        !isset( $this->dtstamp['value']['min'] )   &&
        !isset( $this->dtstamp['value']['sec'] ))
      $this->_makeDtstamp();
    $formatted  = $this->_format_date_time( $this->dtstamp['value'], 7 );
    $attributes = $this->_createParams( $this->dtstamp['params'] );
    return $this->_createElement( 'DTSTAMP', $attributes, $formatted );
  }
/**
 * computes datestamp for calendar component object instance dtstamp
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 1.x.x - 2007-05-13
 * @return void
 */
  function _makeDtstamp() {
    $this->dtstamp['value'] = array( 'year'  => date( 'Y' )
                                   , 'month' => date( 'm' )
                                   , 'day'   => date( 'd' )
                                   , 'hour'  => date( 'H' )
                                   , 'min'   => date( 'i' )
                                   , 'sec'   => date( 's' ) - date( 'Z' ));
    $this->dtstamp['params'] = null;
  }
/**
 * set calendar component property dtstamp
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @param mixed $year
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param array $params optional
 * @return TRUE
 */
  function setDtstamp( $year, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $params=FALSE ) {
    if( empty( $year ))
      $this->_makeDtstamp();
    else
      $this->dtstamp = $this->_setDate2( $year, $month, $day, $hour, $min, $sec, $params );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: DTSTART
 */
/**
 * creates formatted output for calendar component property dtstart
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-26
 * @return string
 */
  function createDtstart() {
    if( empty( $this->dtstart )) return FALSE;
    if( !isset( $this->dtstart['value']['year'] )  &&
        !isset( $this->dtstart['value']['month'] ) &&
        !isset( $this->dtstart['value']['day'] )   &&
        !isset( $this->dtstart['value']['hour'] )  &&
        !isset( $this->dtstart['value']['min'] )   &&
        !isset( $this->dtstart['value']['sec'] ))
    if( $this->getConfig( 'allowEmpty' ))
      return $this->_createElement( 'DTSTART' );
    else return FALSE;
    if( in_array( $this->objName, array( 'vtimezone', 'standard', 'daylight' )))
      unset( $this->dtstart['value']['tz'], $this->dtstart['params']['TZID'] );
    $formatted  = $this->_format_date_time( $this->dtstart['value'] );
    $attributes = $this->_createParams( $this->dtstart['params'] );
    return $this->_createElement( 'DTSTART', $attributes, $formatted );
  }
/**
 * set calendar component property dtstart
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-11-04
 * @param mixed $year
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param string $tz optional
 * @param array $params optional
 * @return bool
 */
  function setDtstart( $year, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $tz=FALSE, $params=FALSE ) {
    if( empty( $year )) {
      if( $this->getConfig( 'allowEmpty' )) {
        $this->dtstart = array( 'value' => null, 'params' => $this->_setParams( $params ));
        return TRUE;
      }
      else
        return FALSE;
    }
    $this->dtstart = $this->_setDate( $year, $month, $day, $hour, $min, $sec, $tz, $params, 'dtstart' );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: DUE
 */
/**
 * creates formatted output for calendar component property due
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createDue() {
    if( empty( $this->due )) return FALSE;
    if( !isset( $this->due['value']['year'] )  &&
        !isset( $this->due['value']['month'] ) &&
        !isset( $this->due['value']['day'] )   &&
        !isset( $this->due['value']['hour'] )  &&
        !isset( $this->due['value']['min'] )   &&
        !isset( $this->due['value']['sec'] ))
      if( $this->getConfig( 'allowEmpty' ))
        return $this->_createElement( 'DUE' );
      else return FALSE;
    $formatted  = $this->_format_date_time( $this->due['value'] );
    $attributes = $this->_createParams( $this->due['params'] );
    return $this->_createElement( 'DUE', $attributes, $formatted );
  }
/**
 * set calendar component property due
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param mixed $year
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param array $params optional
 * @return bool
 */
  function setDue( $year, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $tz=FALSE, $params=FALSE ) {
    if( empty( $year )) {
      if( $this->getConfig( 'allowEmpty' )) {
        $this->due = array( 'value' => null, 'params' => $this->_setParams( $params ));
        return TRUE;
      }
      else
        return FALSE;
    }
    $this->due = $this->_setDate( $year, $month, $day, $hour, $min, $sec, $tz, $params );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: DURATION
 */
/**
 * creates formatted output for calendar component property duration
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createDuration() {
    if( empty( $this->duration )) return FALSE;
    if( !isset( $this->duration['value']['week'] ) &&
        !isset( $this->duration['value']['day'] )  &&
        !isset( $this->duration['value']['hour'] ) &&
        !isset( $this->duration['value']['min'] )  &&
        !isset( $this->duration['value']['sec'] ))
      if( $this->getConfig( 'allowEmpty' ))
        return $this->_createElement( 'DURATION', array(), null );
      else return FALSE;
    $attributes = $this->_createParams( $this->duration['params'] );
    return $this->_createElement( 'DURATION', $attributes, $this->_format_duration( $this->duration['value'] ));
  }
/**
 * set calendar component property duration
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param mixed $week
 * @param mixed $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param array $params optional
 * @return bool
 */
  function setDuration( $week, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $params=FALSE ) {
    if( empty( $week )) if( $this->getConfig( 'allowEmpty' )) $week = null; else return FALSE;
    if( is_array( $week ) && ( 1 <= count( $week )))
      $this->duration = array( 'value' => $this->_duration_array( $week ), 'params' => $this->_setParams( $day ));
    elseif( is_string( $week ) && ( 3 <= strlen( trim( $week )))) {
      $week = trim( $week );
      if( in_array( substr( $week, 0, 1 ), array( '+', '-' )))
        $week = substr( $week, 1 );
      $this->duration = array( 'value' => $this->_duration_string( $week ), 'params' => $this->_setParams( $day ));
    }
    elseif( empty( $week ) && empty( $day ) && empty( $hour ) && empty( $min ) && empty( $sec ))
      return FALSE;
    else
      $this->duration = array( 'value' => $this->_duration_array( array( $week, $day, $hour, $min, $sec )), 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: EXDATE
 */
/**
 * creates formatted output for calendar component property exdate
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createExdate() {
    if( empty( $this->exdate )) return FALSE;
    $output = null;
    foreach( $this->exdate as $ex => $theExdate ) {
      if( empty( $theExdate['value'] )) {
        if( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'EXDATE' );
        continue;
      }
      $content = $attributes = null;
      foreach( $theExdate['value'] as $eix => $exdatePart ) {
        $parno = count( $exdatePart );
        $formatted = $this->_format_date_time( $exdatePart, $parno );
        if( isset( $theExdate['params']['TZID'] ))
          $formatted = str_replace( 'Z', '', $formatted);
        if( 0 < $eix ) {
          if( isset( $theExdate['value'][0]['tz'] )) {
            if( ctype_digit( substr( $theExdate['value'][0]['tz'], -4 )) ||
               ( 'Z' == $theExdate['value'][0]['tz'] )) {
              if( 'Z' != substr( $formatted, -1 ))
                $formatted .= 'Z';
            }
            else
              $formatted = str_replace( 'Z', '', $formatted );
          }
          else
            $formatted = str_replace( 'Z', '', $formatted );
        }
        $content .= ( 0 < $eix ) ? ','.$formatted : $formatted;
      }
      $attributes .= $this->_createParams( $theExdate['params'] );
      $output .= $this->_createElement( 'EXDATE', $attributes, $content );
    }
    return $output;
  }
/**
 * set calendar component property exdate
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param array exdates
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setExdate( $exdates, $params=FALSE, $index=FALSE ) {
    if( empty( $exdates )) {
      if( $this->getConfig( 'allowEmpty' )) {
        $this->_setMval( $this->exdate, null, $params, FALSE, $index );
        return TRUE;
      }
      else
        return FALSE;
    }
    $input  = array( 'params' => $this->_setParams( $params, array( 'VALUE' => 'DATE-TIME' )));
            /* ev. check 1:st date and save ev. timezone **/
    $this->_chkdatecfg( reset( $exdates ), $parno, $input['params'] );
    $this->_existRem( $input['params'], 'VALUE', 'DATE-TIME' ); // remove default parameter
    foreach( $exdates as $eix => $theExdate ) {
      if( $this->_isArrayTimestampDate( $theExdate ))
        $exdatea = $this->_timestamp2date( $theExdate, $parno );
      elseif(  is_array( $theExdate ))
        $exdatea = $this->_date_time_array( $theExdate, $parno );
      elseif( 8 <= strlen( trim( $theExdate ))) // ex. 2006-08-03 10:12:18
        $exdatea = $this->_date_time_string( $theExdate, $parno );
      if( 3 == $parno )
        unset( $exdatea['hour'], $exdatea['min'], $exdatea['sec'], $exdatea['tz'] );
      elseif( isset( $exdatea['tz'] ))
        $exdatea['tz'] = (string) $exdatea['tz'];
      if(  isset( $input['params']['TZID'] ) ||
         ( isset( $exdatea['tz'] ) && !$this->_isOffset( $exdatea['tz'] )) ||
         ( isset( $input['value'][0] ) && ( !isset( $input['value'][0]['tz'] ))) ||
         ( isset( $input['value'][0]['tz'] ) && !$this->_isOffset( $input['value'][0]['tz'] )))
        unset( $exdatea['tz'] );
      $input['value'][] = $exdatea;
    }
    if( 0 >= count( $input['value'] ))
      return FALSE;
    if( 3 == $parno ) {
      $input['params']['VALUE'] = 'DATE';
      unset( $input['params']['TZID'] );
    }
    $this->_setMval( $this->exdate, $input['value'], $input['params'], FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: EXRULE
 */
/**
 * creates formatted output for calendar component property exrule
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createExrule() {
    if( empty( $this->exrule )) return FALSE;
    return $this->_format_recur( 'EXRULE', $this->exrule );
  }
/**
 * set calendar component property exdate
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param array $exruleset
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setExrule( $exruleset, $params=FALSE, $index=FALSE ) {
    if( empty( $exruleset )) if( $this->getConfig( 'allowEmpty' )) $exruleset = null; else return FALSE;
    $this->_setMval( $this->exrule, $this->_setRexrule( $exruleset ), $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: FREEBUSY
 */
/**
 * creates formatted output for calendar component property freebusy
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createFreebusy() {
    if( empty( $this->freebusy )) return FALSE;
    $output = null;
    foreach( $this->freebusy as $freebusyPart ) {
      if( empty( $freebusyPart['value'] )) {
        if( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'FREEBUSY' );
        continue;
      }
      $attributes = $content = null;
      if( isset( $freebusyPart['value']['fbtype'] )) {
        $attributes .= $this->intAttrDelimiter.'FBTYPE='.$freebusyPart['value']['fbtype'];
        unset( $freebusyPart['value']['fbtype'] );
        $freebusyPart['value'] = array_values( $freebusyPart['value'] );
      }
      else
        $attributes .= $this->intAttrDelimiter.'FBTYPE=BUSY';
      $attributes .= $this->_createParams( $freebusyPart['params'] );
      $fno = 1;
      $cnt = count( $freebusyPart['value']);
      foreach( $freebusyPart['value'] as $periodix => $freebusyPeriod ) {
        $formatted   = $this->_format_date_time( $freebusyPeriod[0] );
        $content .= $formatted;
        $content .= '/';
        $cnt2 = count( $freebusyPeriod[1]);
        if( array_key_exists( 'year', $freebusyPeriod[1] ))      // date-time
          $cnt2 = 7;
        elseif( array_key_exists( 'week', $freebusyPeriod[1] ))  // duration
          $cnt2 = 5;
        if(( 7 == $cnt2 )   &&    // period=  -> date-time
            isset( $freebusyPeriod[1]['year'] )  &&
            isset( $freebusyPeriod[1]['month'] ) &&
            isset( $freebusyPeriod[1]['day'] )) {
          $content .= $this->_format_date_time( $freebusyPeriod[1] );
        }
        else {                                  // period=  -> dur-time
          $content .= $this->_format_duration( $freebusyPeriod[1] );
        }
        if( $fno < $cnt )
          $content .= ',';
        $fno++;
      }
      $output .= $this->_createElement( 'FREEBUSY', $attributes, $content );
    }
    return $output;
  }
/**
 * set calendar component property freebusy
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param string $fbType
 * @param array $fbValues
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setFreebusy( $fbType, $fbValues, $params=FALSE, $index=FALSE ) {
    if( empty( $fbValues )) {
      if( $this->getConfig( 'allowEmpty' )) {
        $this->_setMval( $this->freebusy, null, $params, FALSE, $index );
        return TRUE;
      }
      else
        return FALSE;
    }
    $fbType = strtoupper( $fbType );
    if(( !in_array( $fbType, array( 'FREE', 'BUSY', 'BUSY-UNAVAILABLE', 'BUSY-TENTATIVE' ))) &&
       ( 'X-' != substr( $fbType, 0, 2 )))
      $fbType = 'BUSY';
    $input = array( 'fbtype' => $fbType );
    foreach( $fbValues as $fbPeriod ) {   // periods => period
      $freebusyPeriod = array();
      foreach( $fbPeriod as $fbMember ) { // pairs => singlepart
        $freebusyPairMember = array();
        if( is_array( $fbMember )) {
          if( $this->_isArrayDate( $fbMember )) { // date-time value
            $freebusyPairMember       = $this->_date_time_array( $fbMember, 7 );
            $freebusyPairMember['tz'] = 'Z';
          }
          elseif( $this->_isArrayTimestampDate( $fbMember )) { // timestamp value
            $freebusyPairMember       = $this->_timestamp2date( $fbMember['timestamp'], 7 );
            $freebusyPairMember['tz'] = 'Z';
          }
          else {                                         // array format duration
            $freebusyPairMember = $this->_duration_array( $fbMember );
          }
        }
        elseif(( 3 <= strlen( trim( $fbMember ))) &&    // string format duration
               ( in_array( $fbMember{0}, array( 'P', '+', '-' )))) {
          if( 'P' != $fbMember{0} )
            $fbmember = substr( $fbMember, 1 );
          $freebusyPairMember = $this->_duration_string( $fbMember );
        }
        elseif( 8 <= strlen( trim( $fbMember ))) { // text date ex. 2006-08-03 10:12:18
          $freebusyPairMember       = $this->_date_time_string( $fbMember, 7 );
          $freebusyPairMember['tz'] = 'Z';
        }
        $freebusyPeriod[]   = $freebusyPairMember;
      }
      $input[]              = $freebusyPeriod;
    }
    $this->_setMval( $this->freebusy, $input, $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: GEO
 */
/**
 * creates formatted output for calendar component property geo
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createGeo() {
    if( empty( $this->geo )) return FALSE;
    if( empty( $this->geo['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'GEO' ) : FALSE;
    $attributes = $this->_createParams( $this->geo['params'] );
    $content    = null;
    $content   .= number_format( (float) $this->geo['value']['latitude'], 6, '.', '');
    $content   .= ';';
    $content   .= number_format( (float) $this->geo['value']['longitude'], 6, '.', '');
    return $this->_createElement( 'GEO', $attributes, $content );
  }
/**
 * set calendar component property geo
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param float $latitude
 * @param float $longitude
 * @param array $params optional
 * @return bool
 */
  function setGeo( $latitude, $longitude, $params=FALSE ) {
    if( !empty( $latitude ) && !empty( $longitude )) {
      if( !is_array( $this->geo )) $this->geo = array();
      $this->geo['value']['latitude']  = $latitude;
      $this->geo['value']['longitude'] = $longitude;
      $this->geo['params'] = $this->_setParams( $params );
    }
    elseif( $this->getConfig( 'allowEmpty' ))
      $this->geo = array( 'value' => null, 'params' => $this->_setParams( $params ) );
    else
      return FALSE;
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: LAST-MODIFIED
 */
/**
 * creates formatted output for calendar component property last-modified
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createLastModified() {
    if( empty( $this->lastmodified )) return FALSE;
    $attributes = $this->_createParams( $this->lastmodified['params'] );
    $formatted  = $this->_format_date_time( $this->lastmodified['value'], 7 );
    return $this->_createElement( 'LAST-MODIFIED', $attributes, $formatted );
  }
/**
 * set calendar component property completed
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @param mixed $year optional
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param array $params optional
 * @return boll
 */
  function setLastModified( $year=FALSE, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $params=FALSE ) {
    if( empty( $year ))
      $year = date('Ymd\THis', mktime( date( 'H' ), date( 'i' ), date( 's' ) - date( 'Z'), date( 'm' ), date( 'd' ), date( 'Y' )));
    $this->lastmodified = $this->_setDate2( $year, $month, $day, $hour, $min, $sec, $params );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: LOCATION
 */
/**
 * creates formatted output for calendar component property location
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createLocation() {
    if( empty( $this->location )) return FALSE;
    if( empty( $this->location['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'LOCATION' ) : FALSE;
    $attributes = $this->_createParams( $this->location['params'], array( 'ALTREP', 'LANGUAGE' ));
    $content    = $this->_strrep( $this->location['value'] );
    return $this->_createElement( 'LOCATION', $attributes, $content );
  }
/**
 * set calendar component property location
 '
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param array params optional
 * @return bool
 */
  function setLocation( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->location = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: ORGANIZER
 */
/**
 * creates formatted output for calendar component property organizer
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createOrganizer() {
    if( empty( $this->organizer )) return FALSE;
    if( empty( $this->organizer['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'ORGANIZER' ) : FALSE;
    $attributes = $this->_createParams( $this->organizer['params']
                                      , array( 'CN', 'DIR', 'LANGUAGE', 'SENT-BY' ));
    $content    = 'MAILTO:'.$this->organizer['value'];
    return $this->_createElement( 'ORGANIZER', $attributes, $content );
  }
/**
 * set calendar component property organizer
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param array params optional
 * @return bool
 */
  function setOrganizer( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $value = str_replace ( 'MAILTO:', '', $value );
    $value = str_replace ( 'mailto:', '', $value );
    $this->organizer = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    if( isset( $this->organizer['params']['SENT-BY'] )) {
      if( 'MAILTO' == strtoupper( substr( $this->organizer['params']['SENT-BY'], 0, 6 )))
        $this->organizer['params']['SENT-BY'] = substr( $this->organizer['params']['SENT-BY'], 7 );
    }
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: PERCENT-COMPLETE
 */
/**
 * creates formatted output for calendar component property percent-complete
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @return string
 */
  function createPercentComplete() {
    if( empty( $this->percentcomplete )) return FALSE;
    if( empty( $this->percentcomplete['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'PERCENT-COMPLETE' ) : FALSE;
    $attributes = $this->_createParams( $this->percentcomplete['params'] );
    return $this->_createElement( 'PERCENT-COMPLETE', $attributes, $this->percentcomplete['value'] );
  }
/**
 * set calendar component property percent-complete
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param int $value
 * @param array $params optional
 * @return bool
 */
  function setPercentComplete( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->percentcomplete = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: PRIORITY
 */
/**
 * creates formatted output for calendar component property priority
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createPriority() {
    if( empty( $this->priority )) return FALSE;
    if( empty( $this->priority['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'PRIORITY' ) : FALSE;
    $attributes = $this->_createParams( $this->priority['params'] );
    return $this->_createElement( 'PRIORITY', $attributes, $this->priority['value'] );
  }
/**
 * set calendar component property priority
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param int $value
 * @param array $params optional
 * @return bool
 */
  function setPriority( $value, $params=FALSE  ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->priority = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: RDATE
 */
/**
 * creates formatted output for calendar component property rdate
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-26
 * @return string
 */
  function createRdate() {
    if( empty( $this->rdate )) return FALSE;
    $utctime = ( in_array( $this->objName, array( 'vtimezone', 'standard', 'daylight' ))) ? TRUE : FALSE;
    $output = null;
    if( $utctime  )
      unset( $this->rdate['params']['TZID'] );
    foreach( $this->rdate as $theRdate ) {
      if( empty( $theRdate['value'] )) {
        if( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'RDATE' );
        continue;
      }
      if( $utctime  )
        unset( $theRdate['params']['TZID'] );
      $attributes = $this->_createParams( $theRdate['params'] );
      $cnt = count( $theRdate['value'] );
      $content = null;
      $rno = 1;
      foreach( $theRdate['value'] as $rpix => $rdatePart ) {
        $contentPart = null;
        if( is_array( $rdatePart ) &&
            isset( $theRdate['params']['VALUE'] ) && ( 'PERIOD' == $theRdate['params']['VALUE'] )) { // PERIOD
          if( $utctime )
            unset( $rdatePart[0]['tz'] );
          $formatted = $this->_format_date_time( $rdatePart[0]); // PERIOD part 1
          if( $utctime || !empty( $theRdate['params']['TZID'] ))
            $formatted = str_replace( 'Z', '', $formatted);
          if( 0 < $rpix ) {
            if( !empty( $rdatePart[0]['tz'] ) && $this->_isOffset( $rdatePart[0]['tz'] )) {
              if( 'Z' != substr( $formatted, -1 )) $formatted .= 'Z';
            }
            else
              $formatted = str_replace( 'Z', '', $formatted );
          }
          $contentPart .= $formatted;
          $contentPart .= '/';
          $cnt2 = count( $rdatePart[1]);
          if( array_key_exists( 'year', $rdatePart[1] )) {
            if( array_key_exists( 'hour', $rdatePart[1] ))
              $cnt2 = 7;                                      // date-time
            else
              $cnt2 = 3;                                      // date
          }
          elseif( array_key_exists( 'week', $rdatePart[1] ))  // duration
            $cnt2 = 5;
          if(( 7 == $cnt2 )   &&    // period=  -> date-time
              isset( $rdatePart[1]['year'] )  &&
              isset( $rdatePart[1]['month'] ) &&
              isset( $rdatePart[1]['day'] )) {
            if( $utctime )
              unset( $rdatePart[1]['tz'] );
            $formatted = $this->_format_date_time( $rdatePart[1] ); // PERIOD part 2
            if( $utctime || !empty( $theRdate['params']['TZID'] ))
              $formatted = str_replace( 'Z', '', $formatted);
            if( !empty( $rdatePart[0]['tz'] ) && $this->_isOffset( $rdatePart[0]['tz'] )) {
              if( 'Z' != substr( $formatted, -1 )) $formatted .= 'Z';
            }
            else
              $formatted = str_replace( 'Z', '', $formatted );
           $contentPart .= $formatted;
          }
          else {                                  // period=  -> dur-time
            $contentPart .= $this->_format_duration( $rdatePart[1] );
          }
        } // PERIOD end
        else { // SINGLE date start
          if( $utctime )
            unset( $rdatePart['tz'] );
          $formatted = $this->_format_date_time( $rdatePart);
          if( $utctime || !empty( $theRdate['params']['TZID'] ))
            $formatted = str_replace( 'Z', '', $formatted);
          if( !$utctime && ( 0 < $rpix )) {
            if( !empty( $theRdate['value'][0]['tz'] ) && $this->_isOffset( $theRdate['value'][0]['tz'] )) {
              if( 'Z' != substr( $formatted, -1 ))
                $formatted .= 'Z';
            }
            else
              $formatted = str_replace( 'Z', '', $formatted );
          }
          $contentPart .= $formatted;
        }
        $content .= $contentPart;
        if( $rno < $cnt )
          $content .= ',';
        $rno++;
      }
      $output    .= $this->_createElement( 'RDATE', $attributes, $content );
    }
    return $output;
  }
/**
 * set calendar component property rdate
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-07
 * @param array $rdates
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setRdate( $rdates, $params=FALSE, $index=FALSE ) {
    if( empty( $rdates )) {
      if( $this->getConfig( 'allowEmpty' )) {
        $this->_setMval( $this->rdate, null, $params, FALSE, $index );
        return TRUE;
      }
      else
        return FALSE;
    }
    $input = array( 'params' => $this->_setParams( $params, array( 'VALUE' => 'DATE-TIME' )));
    if( in_array( $this->objName, array( 'vtimezone', 'standard', 'daylight' ))) {
      unset( $input['params']['TZID'] );
      $input['params']['VALUE'] = 'DATE-TIME';
    }
            /*  check if PERIOD, if not set */
    if((!isset( $input['params']['VALUE'] ) || !in_array( $input['params']['VALUE'], array( 'DATE', 'PERIOD' ))) &&
          isset( $rdates[0] )    && is_array( $rdates[0] ) && ( 2 == count( $rdates[0] )) &&
          isset( $rdates[0][0] ) &&    isset( $rdates[0][1] ) && !isset( $rdates[0]['timestamp'] ) &&
    (( is_array( $rdates[0][0] ) && ( isset( $rdates[0][0]['timestamp'] ) ||
                                      $this->_isArrayDate( $rdates[0][0] ))) ||
                                    ( is_string( $rdates[0][0] ) && ( 8 <= strlen( trim( $rdates[0][0] )))))  &&
     ( is_array( $rdates[0][1] ) || ( is_string( $rdates[0][1] ) && ( 3 <= strlen( trim( $rdates[0][1] ))))))
      $input['params']['VALUE'] = 'PERIOD';
            /* check 1:st date, upd. $parno (opt) and save ev. timezone **/
    $date  = reset( $rdates );
    if( isset( $input['params']['VALUE'] ) && ( 'PERIOD' == $input['params']['VALUE'] )) // PERIOD
      $date  = reset( $date );
    $this->_chkdatecfg( $date, $parno, $input['params'] );
    if( in_array( $this->objName, array( 'vtimezone', 'standard', 'daylight' )))
      unset( $input['params']['TZID'] );
    $this->_existRem( $input['params'], 'VALUE', 'DATE-TIME' ); // remove default
    foreach( $rdates as $rpix => $theRdate ) {
      $inputa = null;
      if( is_array( $theRdate )) {
        if( isset( $input['params']['VALUE'] ) && ( 'PERIOD' == $input['params']['VALUE'] )) { // PERIOD
          foreach( $theRdate as $rix => $rPeriod ) {
            if( is_array( $rPeriod )) {
              if( $this->_isArrayTimestampDate( $rPeriod ))      // timestamp
                $inputab  = ( isset( $rPeriod['tz'] )) ? $this->_timestamp2date( $rPeriod, $parno ) : $this->_timestamp2date( $rPeriod, 6 );
              elseif( $this->_isArrayDate( $rPeriod ))
                $inputab  = ( 3 < count ( $rPeriod )) ? $this->_date_time_array( $rPeriod, $parno ) : $this->_date_time_array( $rPeriod, 6 );
              elseif (( 1 == count( $rPeriod )) && ( 8 <= strlen( reset( $rPeriod ))))  // text-date
                $inputab  = $this->_date_time_string( reset( $rPeriod ), $parno );
              else                                               // array format duration
                $inputab  = $this->_duration_array( $rPeriod );
            }
            elseif(( 3 <= strlen( trim( $rPeriod ))) &&          // string format duration
                   ( in_array( $rPeriod{0}, array( 'P', '+', '-' )))) {
              if( 'P' != $rPeriod{0} )
                $rPeriod  = substr( $rPeriod, 1 );
              $inputab    = $this->_duration_string( $rPeriod );
            }
            elseif( 8 <= strlen( trim( $rPeriod )))              // text date ex. 2006-08-03 10:12:18
              $inputab    = $this->_date_time_string( $rPeriod, $parno );
            if(  isset( $input['params']['TZID'] ) ||
               ( isset( $inputab['tz'] )   && !$this->_isOffset( $inputab['tz'] )) ||
               ( isset( $inputa[0] )       && ( !isset( $inputa[0]['tz'] )))       ||
               ( isset( $inputa[0]['tz'] ) && !$this->_isOffset( $inputa[0]['tz'] )))
              unset( $inputab['tz'] );
            $inputa[]     = $inputab;
          }
        } // PERIOD end
        elseif ( $this->_isArrayTimestampDate( $theRdate ))      // timestamp
          $inputa = $this->_timestamp2date( $theRdate, $parno );
        else                                                     // date[-time]
          $inputa = $this->_date_time_array( $theRdate, $parno );
      }
      elseif( 8 <= strlen( trim( $theRdate )))                   // text date ex. 2006-08-03 10:12:18
        $inputa       = $this->_date_time_string( $theRdate, $parno );
      if( !isset( $input['params']['VALUE'] ) || ( 'PERIOD' != $input['params']['VALUE'] )) { // no PERIOD
        if( 3 == $parno )
          unset( $inputa['hour'], $inputa['min'], $inputa['sec'], $inputa['tz'] );
        elseif( isset( $inputa['tz'] ))
          $inputa['tz'] = (string) $inputa['tz'];
        if(  isset( $input['params']['TZID'] ) ||
           ( isset( $inputa['tz'] )            && !$this->_isOffset( $inputa['tz'] ))     ||
           ( isset( $input['value'][0] )       && ( !isset( $input['value'][0]['tz'] )))  ||
           ( isset( $input['value'][0]['tz'] ) && !$this->_isOffset( $input['value'][0]['tz'] )))
          unset( $inputa['tz'] );
      }
      $input['value'][] = $inputa;
    }
    if( 3 == $parno ) {
      $input['params']['VALUE'] = 'DATE';
      unset( $input['params']['TZID'] );
    }
    $this->_setMval( $this->rdate, $input['value'], $input['params'], FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: RECURRENCE-ID
 */
/**
 * creates formatted output for calendar component property recurrence-id
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createRecurrenceid() {
    if( empty( $this->recurrenceid )) return FALSE;
    if( empty( $this->recurrenceid['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'RECURRENCE-ID' ) : FALSE;
    $formatted  = $this->_format_date_time( $this->recurrenceid['value'] );
    $attributes = $this->_createParams( $this->recurrenceid['params'] );
    return $this->_createElement( 'RECURRENCE-ID', $attributes, $formatted );
  }
/**
 * set calendar component property recurrence-id
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @param mixed $year
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param array $params optional
 * @return bool
 */
  function setRecurrenceid( $year, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $tz=FALSE, $params=FALSE ) {
    if( empty( $year )) {
      if( $this->getConfig( 'allowEmpty' )) {
        $this->recurrenceid = array( 'value' => null, 'params' => null );
        return TRUE;
      }
      else
        return FALSE;
    }
    $this->recurrenceid = $this->_setDate( $year, $month, $day, $hour, $min, $sec, $tz, $params );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: RELATED-TO
 */
/**
 * creates formatted output for calendar component property related-to
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @return string
 */
  function createRelatedTo() {
    if( empty( $this->relatedto )) return FALSE;
    $output = null;
    foreach( $this->relatedto as $relation ) {
      if( empty( $relation['value'] )) {
        if( $this->getConfig( 'allowEmpty' )) $output.= $this->_createElement( 'RELATED-TO', $this->_createParams( $relation['params'] ));
        continue;
      }
      $attributes = $this->_createParams( $relation['params'] );
      $content    = ( 'xcal' != $this->format ) ? '<' : '';
      $content   .= $this->_strrep( $relation['value'] );
      $content   .= ( 'xcal' != $this->format ) ? '>' : '';
      $output    .= $this->_createElement( 'RELATED-TO', $attributes, $content );
    }
    return $output;
  }
/**
 * set calendar component property related-to
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-07
 * @param float $relid
 * @param array $params, optional
 * @param index $index, optional
 * @return bool
 */
  function setRelatedTo( $value, $params=FALSE, $index=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    if(( '<' == substr( $value, 0, 1 )) && ( '>' == substr( $value, -1 )))
      $value = substr( $value, 1, ( strlen( $value ) - 2 ));
    $this->_existRem( $params, 'RELTYPE', 'PARENT', TRUE ); // remove default
    $this->_setMval( $this->relatedto, $value, $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: REPEAT
 */
/**
 * creates formatted output for calendar component property repeat
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createRepeat() {
    if( empty( $this->repeat )) return FALSE;
    if( empty( $this->repeat['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'REPEAT' ) : FALSE;
    $attributes = $this->_createParams( $this->repeat['params'] );
    return $this->_createElement( 'REPEAT', $attributes, $this->repeat['value'] );
  }
/**
 * set calendar component property transp
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param array $params optional
 * @return void
 */
  function setRepeat( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->repeat = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: REQUEST-STATUS
 */
/**
 * creates formatted output for calendar component property request-status
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @return string
 */
  function createRequestStatus() {
    if( empty( $this->requeststatus )) return FALSE;
    $output = null;
    foreach( $this->requeststatus as $rstat ) {
      if( empty( $rstat['value']['statcode'] )) {
        if( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'REQUEST-STATUS' );
        continue;
      }
      $attributes  = $this->_createParams( $rstat['params'], array( 'LANGUAGE' ));
      $content     = number_format( (float) $rstat['value']['statcode'], 2, '.', '');
      $content    .= ';'.$this->_strrep( $rstat['value']['text'] );
      if( isset( $rstat['value']['extdata'] ))
        $content  .= ';'.$this->_strrep( $rstat['value']['extdata'] );
      $output     .= $this->_createElement( 'REQUEST-STATUS', $attributes, $content );
    }
    return $output;
  }
/**
 * set calendar component property request-status
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param float $statcode
 * @param string $text
 * @param string $extdata, optional
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setRequestStatus( $statcode, $text, $extdata=FALSE, $params=FALSE, $index=FALSE ) {
    if( empty( $statcode ) || empty( $text )) if( $this->getConfig( 'allowEmpty' )) $statcode = $text = null; else return FALSE;
    $input              = array( 'statcode' => $statcode, 'text' => $text );
    if( $extdata )
      $input['extdata'] = $extdata;
    $this->_setMval( $this->requeststatus, $input, $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: RESOURCES
 */
/**
 * creates formatted output for calendar component property resources
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @return string
 */
  function createResources() {
    if( empty( $this->resources )) return FALSE;
    $output = null;
    foreach( $this->resources as $resource ) {
      if( empty( $resource['value'] )) {
        if( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'RESOURCES' );
        continue;
      }
      $attributes  = $this->_createParams( $resource['params'], array( 'ALTREP', 'LANGUAGE' ));
      if( is_array( $resource['value'] )) {
        foreach( $resource['value'] as $rix => $resourcePart )
          $resource['value'][$rix] = $this->_strrep( $resourcePart );
        $content   = implode( ',', $resource['value'] );
      }
      else
        $content   = $this->_strrep( $resource['value'] );
      $output     .= $this->_createElement( 'RESOURCES', $attributes, $content );
    }
    return $output;
  }
/**
 * set calendar component property recources
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param mixed $value
 * @param array $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setResources( $value, $params=FALSE, $index=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->_setMval( $this->resources, $value, $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: RRULE
 */
/**
 * creates formatted output for calendar component property rrule
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createRrule() {
    if( empty( $this->rrule )) return FALSE;
    return $this->_format_recur( 'RRULE', $this->rrule );
  }
/**
 * set calendar component property rrule
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param array $rruleset
 * @param array $params, optional
 * @param integer $index, optional
 * @return void
 */
  function setRrule( $rruleset, $params=FALSE, $index=FALSE ) {
    if( empty( $rruleset )) if( $this->getConfig( 'allowEmpty' )) $rruleset = null; else return FALSE;
    $this->_setMval( $this->rrule, $this->_setRexrule( $rruleset ), $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: SEQUENCE
 */
/**
 * creates formatted output for calendar component property sequence
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-20
 * @return string
 */
  function createSequence() {
    if( empty( $this->sequence )) return FALSE;
    if( empty( $this->sequence['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'SEQUENCE' ) : FALSE;
    $attributes = $this->_createParams( $this->sequence['params'] );
    return $this->_createElement( 'SEQUENCE', $attributes, $this->sequence['value'] );
  }
/**
 * set calendar component property sequence
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param int $value optional
 * @param array $params optional
 * @return bool
 */
  function setSequence( $value=FALSE, $params=FALSE ) {
    if( empty( $value ))
      $value = ( isset( $this->sequence['value'] ) && ( 0 < $this->sequence['value'] )) ? $this->sequence['value'] + 1 : 1;
    $this->sequence = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: STATUS
 */
/**
 * creates formatted output for calendar component property status
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createStatus() {
    if( empty( $this->status )) return FALSE;
    if( empty( $this->status['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'STATUS' ) : FALSE;
    $attributes = $this->_createParams( $this->status['params'] );
    return $this->_createElement( 'STATUS', $attributes, $this->status['value'] );
  }
/**
 * set calendar component property status
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param array $params optional
 * @return bool
 */
  function setStatus( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->status = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: SUMMARY
 */
/**
 * creates formatted output for calendar component property summary
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createSummary() {
    if( empty( $this->summary )) return FALSE;
    if( empty( $this->summary['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'SUMMARY' ) : FALSE;
    $attributes = $this->_createParams( $this->summary['params'], array( 'ALTREP', 'LANGUAGE' ));
    $content    = $this->_strrep( $this->summary['value'] );
    return $this->_createElement( 'SUMMARY', $attributes, $content );
  }
/**
 * set calendar component property summary
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param string $params optional
 * @return bool
 */
  function setSummary( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->summary = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: TRANSP
 */
/**
 * creates formatted output for calendar component property transp
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createTransp() {
    if( empty( $this->transp )) return FALSE;
    if( empty( $this->transp['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'TRANSP' ) : FALSE;
    $attributes = $this->_createParams( $this->transp['params'] );
    return $this->_createElement( 'TRANSP', $attributes, $this->transp['value'] );
  }
/**
 * set calendar component property transp
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param string $params optional
 * @return bool
 */
  function setTransp( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->transp = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: TRIGGER
 */
/**
 * creates formatted output for calendar component property trigger
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-21
 * @return string
 */
  function createTrigger() {
    if( empty( $this->trigger )) return FALSE;
    if( empty( $this->trigger['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'TRIGGER' ) : FALSE;
    $content = $attributes = null;
    if( isset( $this->trigger['value']['year'] )   &&
        isset( $this->trigger['value']['month'] )  &&
        isset( $this->trigger['value']['day'] ))
      $content      .= $this->_format_date_time( $this->trigger['value'] );
    else {
      if( TRUE !== $this->trigger['value']['relatedStart'] )
        $attributes .= $this->intAttrDelimiter.'RELATED=END';
      if( $this->trigger['value']['before'] )
        $content    .= '-';
      $content      .= $this->_format_duration( $this->trigger['value'] );
    }
    $attributes     .= $this->_createParams( $this->trigger['params'] );
    return $this->_createElement( 'TRIGGER', $attributes, $content );
  }
/**
 * set calendar component property trigger
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-11-04
 * @param mixed $year
 * @param mixed $month optional
 * @param int $day optional
 * @param int $week optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param bool $relatedStart optional
 * @param bool $before optional
 * @param array $params optional
 * @return bool
 */
  function setTrigger( $year, $month=null, $day=null, $week=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $relatedStart=TRUE, $before=TRUE, $params=FALSE ) {
    if( empty( $year ) && empty( $month ) && empty( $day ) && empty( $week ) && empty( $hour ) && empty( $min ) && empty( $sec ))
      if( $this->getConfig( 'allowEmpty' )) {
        $this->trigger = array( 'value' => null, 'params' => $this->_setParams( $params ) );
        return TRUE;
      }
      else
        return FALSE;
    if( $this->_isArrayTimestampDate( $year )) { // timestamp
      $params = $this->_setParams( $month );
      $date   = $this->_timestamp2date( $year, 7 );
      foreach( $date as $k => $v )
        $$k = $v;
    }
    elseif( is_array( $year ) && ( is_array( $month ) || empty( $month ))) {
      $params = $this->_setParams( $month );
      if(!(array_key_exists( 'year',  $year ) &&   // exclude date-time
           array_key_exists( 'month', $year ) &&
           array_key_exists( 'day',   $year ))) {  // so this must be a duration
        if( isset( $params['RELATED'] ) && ( 'END' == $params['RELATED'] ))
          $relatedStart = FALSE;
        else
          $relatedStart = ( array_key_exists( 'relatedStart', $year ) && ( TRUE !== $year['relatedStart'] )) ? FALSE : TRUE;
        $before         = ( array_key_exists( 'before', $year )       && ( TRUE !== $year['before'] ))       ? FALSE : TRUE;
      }
      $SSYY  = ( array_key_exists( 'year',  $year )) ? $year['year']  : null;
      $month = ( array_key_exists( 'month', $year )) ? $year['month'] : null;
      $day   = ( array_key_exists( 'day',   $year )) ? $year['day']   : null;
      $week  = ( array_key_exists( 'week',  $year )) ? $year['week']  : null;
      $hour  = ( array_key_exists( 'hour',  $year )) ? $year['hour']  : 0; //null;
      $min   = ( array_key_exists( 'min',   $year )) ? $year['min']   : 0; //null;
      $sec   = ( array_key_exists( 'sec',   $year )) ? $year['sec']   : 0; //null;
      $year  = $SSYY;
    }
    elseif(is_string( $year ) && ( is_array( $month ) || empty( $month ))) {  // duration or date in a string
      $params = $this->_setParams( $month );
      if( in_array( $year{0}, array( 'P', '+', '-' ))) { // duration
        $relatedStart = ( isset( $params['RELATED'] ) && ( 'END' == $params['RELATED'] )) ? FALSE : TRUE;
        $before       = ( '-'  == $year{0} ) ? TRUE : FALSE;
        if(     'P'  != $year{0} )
          $year       = substr( $year, 1 );
        $date         = $this->_duration_string( $year);
      }
      else   // date
        $date    = $this->_date_time_string( $year, 7 );
      unset( $year, $month, $day );
      foreach( $date as $k => $v )
        $$k = $v;
    }
    else // single values in function input parameters
      $params = $this->_setParams( $params );
    if( !empty( $year ) && !empty( $month ) && !empty( $day )) { // date
      $params['VALUE'] = 'DATE-TIME';
      $hour = ( $hour ) ? $hour : 0;
      $min  = ( $min  ) ? $min  : 0;
      $sec  = ( $sec  ) ? $sec  : 0;
      $this->trigger = array( 'params' => $params );
      $this->trigger['value'] = array( 'year'  => $year
                                     , 'month' => $month
                                     , 'day'   => $day
                                     , 'hour'  => $hour
                                     , 'min'   => $min
                                     , 'sec'   => $sec
                                     , 'tz'    => 'Z' );
      return TRUE;
    }
    elseif(( empty( $year ) && empty( $month )) &&    // duration
           (!empty( $week ) || !empty( $day ) || !empty( $hour ) || !empty( $min ) || !empty( $sec ))) {
      unset( $params['RELATED'] ); // set at output creation (END only)
      unset( $params['VALUE'] );   // 'DURATION' default
      $this->trigger = array( 'params' => $params );
      $relatedStart = ( FALSE !== $relatedStart ) ? TRUE : FALSE;
      $before       = ( FALSE !== $before )       ? TRUE : FALSE;
      $this->trigger['value']  = array( 'relatedStart' => $relatedStart
                                      , 'before'       => $before );
      if( !empty( $week )) $this->trigger['value']['week'] = $week;
      if( !empty( $day  )) $this->trigger['value']['day']  = $day;
      if( !empty( $hour )) $this->trigger['value']['hour'] = $hour;
      if( !empty( $min  )) $this->trigger['value']['min']  = $min;
      if( !empty( $sec  )) $this->trigger['value']['sec']  = $sec;
      return TRUE;
    }
    return FALSE;
  }
/*********************************************************************************/
/**
 * Property Name: TZID
 */
/**
 * creates formatted output for calendar component property tzid
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createTzid() {
    if( empty( $this->tzid )) return FALSE;
    if( empty( $this->tzid['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'TZID' ) : FALSE;
    $attributes = $this->_createParams( $this->tzid['params'] );
    return $this->_createElement( 'TZID', $attributes, $this->_strrep( $this->tzid['value'] ));
  }
/**
 * set calendar component property tzid
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param array $params optional
 * @return bool
 */
  function setTzid( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->tzid = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * .. .
 * Property Name: TZNAME
 */
/**
 * creates formatted output for calendar component property tzname
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createTzname() {
    if( empty( $this->tzname )) return FALSE;
    $output = null;
    foreach( $this->tzname as $theName ) {
      if( !empty( $theName['value'] )) {
        $attributes = $this->_createParams( $theName['params'], array( 'LANGUAGE' ));
        $output    .= $this->_createElement( 'TZNAME', $attributes, $this->_strrep( $theName['value'] ));
      }
      elseif( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( 'TZNAME' );
    }
    return $output;
  }
/**
 * set calendar component property tzname
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param string $value
 * @param string $params, optional
 * @param integer $index, optional
 * @return bool
 */
  function setTzname( $value, $params=FALSE, $index=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->_setMval( $this->tzname, $value, $params, FALSE, $index );
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: TZOFFSETFROM
 */
/**
 * creates formatted output for calendar component property tzoffsetfrom
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createTzoffsetfrom() {
    if( empty( $this->tzoffsetfrom )) return FALSE;
    if( empty( $this->tzoffsetfrom['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'TZOFFSETFROM' ) : FALSE;
    $attributes = $this->_createParams( $this->tzoffsetfrom['params'] );
    return $this->_createElement( 'TZOFFSETFROM', $attributes, $this->tzoffsetfrom['value'] );
  }
/**
 * set calendar component property tzoffsetfrom
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param string $params optional
 * @return bool
 */
  function setTzoffsetfrom( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->tzoffsetfrom = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: TZOFFSETTO
 */
/**
 * creates formatted output for calendar component property tzoffsetto
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createTzoffsetto() {
    if( empty( $this->tzoffsetto )) return FALSE;
    if( empty( $this->tzoffsetto['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'TZOFFSETTO' ) : FALSE;
    $attributes = $this->_createParams( $this->tzoffsetto['params'] );
    return $this->_createElement( 'TZOFFSETTO', $attributes, $this->tzoffsetto['value'] );
  }
/**
 * set calendar component property tzoffsetto
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param string $params optional
 * @return bool
 */
  function setTzoffsetto( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->tzoffsetto = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: TZURL
 */
/**
 * creates formatted output for calendar component property tzurl
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createTzurl() {
    if( empty( $this->tzurl )) return FALSE;
    if( empty( $this->tzurl['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'TZURL' ) : FALSE;
    $attributes = $this->_createParams( $this->tzurl['params'] );
    return $this->_createElement( 'TZURL', $attributes, $this->tzurl['value'] );
  }
/**
 * set calendar component property tzurl
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param string $params optional
 * @return boll
 */
  function setTzurl( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->tzurl = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: UID
 */
/**
 * creates formatted output for calendar component property uid
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-20
 * @return string
 */
  function createUid() {
    if( 0 >= count( $this->uid ))
      $this->_makeuid();
    $attributes = $this->_createParams( $this->uid['params'] );
    return $this->_createElement( 'UID', $attributes, $this->uid['value'] );
  }
/**
 * create an unique id for this calendar component object instance
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.7 - 2007-09-04
 * @return void
 */
  function _makeUid() {
    $date   = date('Ymd\THisT');
    $unique = substr(microtime(), 2, 4);
    $base   = 'aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPrRsStTuUvVxXuUvVwWzZ1234567890';
    $start  = 0;
    $end    = strlen( $base ) - 1;
    $length = 6;
    $str    = null;
    for( $p = 0; $p < $length; $p++ )
      $unique .= $base{mt_rand( $start, $end )};
    $this->uid = array( 'params' => null );
    $this->uid['value']  = $date.'-'.$unique.'@'.$this->getConfig( 'unique_id' );
  }
/**
 * set calendar component property uid
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param string $params optional
 * @return bool
 */
  function setUid( $value, $params=FALSE ) {
    if( empty( $value )) return FALSE; // no allowEmpty check here !!!!
    $this->uid = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: URL
 */
/**
 * creates formatted output for calendar component property url
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createUrl() {
    if( empty( $this->url )) return FALSE;
    if( empty( $this->url['value'] ))
      return ( $this->getConfig( 'allowEmpty' )) ? $this->_createElement( 'URL' ) : FALSE;
    $attributes = $this->_createParams( $this->url['params'] );
    return $this->_createElement( 'URL', $attributes, $this->url['value'] );
  }
/**
 * set calendar component property url
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-11-04
 * @param string $value
 * @param string $params optional
 * @return bool
 */
  function setUrl( $value, $params=FALSE ) {
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $this->url = array( 'value' => $value, 'params' => $this->_setParams( $params ));
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: x-prop
 */
/**
 * creates formatted output for calendar component property x-prop
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.11 - 2008-10-22
 * @return string
 */
  function createXprop() {
    if( empty( $this->xprop )) return FALSE;
    $output = null;
    foreach( $this->xprop as $label => $xpropPart ) {
      if( empty( $xpropPart['value'] )) {
        if( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( $label );
        continue;
      }
      $attributes = $this->_createParams( $xpropPart['params'], array( 'LANGUAGE' ));
      if( is_array( $xpropPart['value'] )) {
        foreach( $xpropPart['value'] as $pix => $theXpart )
          $xpropPart['value'][$pix] = $this->_strrep( $theXpart );
        $xpropPart['value']  = implode( ',', $xpropPart['value'] );
      }
      else
        $xpropPart['value'] = $this->_strrep( $xpropPart['value'] );
      $output    .= $this->_createElement( $label, $attributes, $xpropPart['value'] );
    }
    return $output;
  }
/**
 * set calendar component property x-prop
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
	* @since 2.4.11 - 2008-11-04
 * @param string $label
 * @param mixed $value
 * @param array $params optional
 * @return bool
 */
  function setXprop( $label, $value, $params=FALSE ) {
    if( empty( $label )) return;
    if( empty( $value )) if( $this->getConfig( 'allowEmpty' )) $value = null; else return FALSE;
    $xprop           = array( 'value' => $value );
    $toolbox         = new calendarComponent();
    $xprop['params'] = $toolbox->_setParams( $params );
    if( !is_array( $this->xprop )) $this->xprop = array();
    $this->xprop[strtoupper( $label )] = $xprop;
    return TRUE;
  }
/*********************************************************************************/
/*********************************************************************************/
/**
 * create element format parts
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.0.6 - 2006-06-20
 * @return string
 */
  function _createFormat() {
    $objectname                   = null;
    switch( $this->format ) {
      case 'xcal':
        $objectname               = ( isset( $this->timezonetype )) ?
                                 strtolower( $this->timezonetype )  :  strtolower( $this->objName );
        $this->componentStart1    = $this->elementStart1 = '<';
        $this->componentStart2    = $this->elementStart2 = '>';
        $this->componentEnd1      = $this->elementEnd1   = '</';
        $this->componentEnd2      = $this->elementEnd2   = '>'.$this->nl;
        $this->intAttrDelimiter   = '<!-- -->';
        $this->attributeDelimiter = $this->nl;
        $this->valueInit          = null;
        break;
      default:
        $objectname               = ( isset( $this->timezonetype )) ?
                                 strtoupper( $this->timezonetype )  :  strtoupper( $this->objName );
        $this->componentStart1    = 'BEGIN:';
        $this->componentStart2    = null;
        $this->componentEnd1      = 'END:';
        $this->componentEnd2      = $this->nl;
        $this->elementStart1      = null;
        $this->elementStart2      = null;
        $this->elementEnd1        = null;
        $this->elementEnd2        = $this->nl;
        $this->intAttrDelimiter   = '<!-- -->';
        $this->attributeDelimiter = ';';
        $this->valueInit          = ':';
        break;
    }
    return $objectname;
  }
/**
 * creates formatted output for calendar component property
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-23
 * @param string $label property name
 * @param string $attributes property attributes
 * @param string $content property content (optional)
 * @return string
 */
  function _createElement( $label, $attributes=null, $content=FALSE ) {
    $label  = $this->_formatPropertyName( $label );
    $output = $this->elementStart1.$label;
    $categoriesAttrLang = null;
    $attachInlineBinary = FALSE;
    $attachfmttype      = null;
    if( !empty( $attributes ))  {
      $attributes  = trim( $attributes );
      if ( 'xcal' == $this->format) {
        $attributes2 = explode( $this->intAttrDelimiter, $attributes );
        $attributes  = null;
        foreach( $attributes2 as $attribute ) {
          $attrKVarr = explode( '=', $attribute );
          if( empty( $attrKVarr[0] ))
            continue;
          if( !isset( $attrKVarr[1] )) {
            $attrValue = $attrKVarr[0];
            $attrKey   = null;
          }
          elseif( 2 == count( $attrKVarr)) {
            $attrKey   = strtolower( $attrKVarr[0] );
            $attrValue = $attrKVarr[1];
          }
          else {
            $attrKey   = strtolower( $attrKVarr[0] );
            unset( $attrKVarr[0] );
            $attrValue = implode( '=', $attrKVarr );
          }
          if(( 'attach' == $label ) && ( in_array( $attrKey, array( 'fmttype', 'encoding', 'value' )))) {
            $attachInlineBinary = TRUE;
            if( 'fmttype' == $attrKey )
              $attachfmttype = $attrKey.'='.$attrValue;
            continue;
          }
          elseif(( 'categories' == $label ) && ( 'language' == $attrKey ))
            $categoriesAttrLang = $attrKey.'='.$attrValue;
          else {
            $attributes .= ( empty( $attributes )) ? ' ' : $this->attributeDelimiter.' ';
            $attributes .= ( !empty( $attrKey )) ? $attrKey.'=' : null;
            if(( '"' == substr( $attrValue, 0, 1 )) && ( '"' == substr( $attrValue, -1 ))) {
              $attrValue = substr( $attrValue, 1, ( strlen( $attrValue ) - 2 ));
              $attrValue = str_replace( '"', '', $attrValue );
            }
            $attributes .= '"'.htmlspecialchars( $attrValue ).'"';
          }
        }
      }
      else {
        $attributes = str_replace( $this->intAttrDelimiter, $this->attributeDelimiter, $attributes );
      }
    }
    if(((( 'attach' == $label ) && !$attachInlineBinary ) ||
         ( in_array( $label, array( 'tzurl', 'url' ))))      && ( 'xcal' == $this->format)) {
      $pos = strrpos($content, "/");
      $docname = ( $pos !== false) ? substr( $content, (1 - strlen( $content ) + $pos )) : $content;
      $this->xcaldecl[] = array( 'xmldecl'  => 'ENTITY'
                               , 'uri'      => $docname
                               , 'ref'      => 'SYSTEM'
                               , 'external' => $content
                               , 'type'     => 'NDATA'
                               , 'type2'    => 'BINERY' );
      $attributes .= ( empty( $attributes )) ? ' ' : $this->attributeDelimiter.' ';
      $attributes .= 'uri="'.$docname.'"';
      $content = null;
      if( 'attach' == $label ) {
        $attributes = str_replace( $this->attributeDelimiter, $this->intAttrDelimiter, $attributes );
        $content = $this->_createElement( 'extref', $attributes, null );
        $attributes = null;
      }
    }
    elseif(( 'attach' == $label ) && $attachInlineBinary && ( 'xcal' == $this->format)) {
      $content = $this->nl.$this->_createElement( 'b64bin', $attachfmttype, $content ); // max one attribute
    }
    $output .= $attributes;
    if( !$content ) {
      switch( $this->format ) {
        case 'xcal':
          $output .= ' /';
          $output .= $this->elementStart2;
          return $output;
          break;
        default:
          $output .= $this->elementStart2.$this->valueInit;
          return $this->_size75( $output );
          break;
      }
    }
    $output .= $this->elementStart2;
    $output .= $this->valueInit.$content;
    switch( $this->format ) {
      case 'xcal':
        return $output.$this->elementEnd1.$label.$this->elementEnd2;
        break;
      default:
        return $this->_size75( $output );
        break;
    }
  }
/**
 * creates formatted output for calendar component property parameters
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.22 - 2007-04-10
 * @param array $params  optional
 * @param array $ctrKeys optional
 * @return string
 */
  function _createParams( $params=array(), $ctrKeys=array() ) {
    $attrLANG = $attr1 = $attr2 = null;
    $CNattrKey   = ( in_array( 'CN',       $ctrKeys )) ? TRUE : FALSE ;
    $LANGattrKey = ( in_array( 'LANGUAGE', $ctrKeys )) ? TRUE : FALSE ;
    $CNattrExist = $LANGattrExist = FALSE;
    if( is_array( $params )) {
      foreach( $params as $paramKey => $paramValue ) {
        if( is_int( $paramKey ))
          $attr2            .= $this->intAttrDelimiter.$paramValue;
        elseif(( 'LANGUAGE' == $paramKey ) && $LANGattrKey ) {
          $attrLANG         .= $this->intAttrDelimiter."LANGUAGE=$paramValue";
          $LANGattrExist     = TRUE;
        }
        elseif(( 'CN'       == $paramKey ) && $CNattrKey ) {
          $attr1             = $this->intAttrDelimiter.'CN="'.$paramValue.'"';
          $CNattrExist       = TRUE;
        }
        elseif(( 'ALTREP'   == $paramKey ) && in_array( $paramKey, $ctrKeys ))
          $attr2            .= $this->intAttrDelimiter.'ALTREP="'.$paramValue.'"';
        elseif(( 'DIR'      == $paramKey ) && in_array( $paramKey, $ctrKeys ))
          $attr2            .= $this->intAttrDelimiter.'DIR="'.$paramValue.'"';
        elseif(( 'SENT-BY'  == $paramKey ) && in_array( $paramKey, $ctrKeys ))
          $attr2            .= $this->intAttrDelimiter.'SENT-BY="MAILTO:'.$paramValue.'"';
        else
          $attr2            .= $this->intAttrDelimiter."$paramKey=$paramValue";
      }
    }
    if( !$LANGattrExist ) {
      $lang = $this->getConfig( 'language' );
      if(( $CNattrExist || $LANGattrKey ) && $lang )
        $attrLANG .= $this->intAttrDelimiter.'LANGUAGE='.$lang;
    }
    return $attrLANG.$attr1.$attr2;
  }
/**
 * check a date(-time) for an opt. timezone and if it is a DATE-TIME or DATE
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-25
 * @param array $date, date to check
 * @param int $parno, no of date parts (i.e. year, month.. .)
 * @return array $params, property parameters
 */
  function _chkdatecfg( $theDate, & $parno, & $params ) {
    if( isset( $params['TZID'] ))
      $parno = 6;
    elseif( isset( $params['VALUE'] ) && ( 'DATE' == $params['VALUE'] ))
      $parno = 3;
    else {
      if( isset( $params['VALUE'] ) && ( 'PERIOD' == $params['VALUE'] ))
        $parno = 7;
      if( is_array( $theDate )) {
        if( isset( $theDate['timestamp'] ))
          $tzid = ( isset( $theDate['tz'] )) ? $theDate['tz'] : null;
        else
          $tzid = ( isset( $theDate['tz'] )) ? $theDate['tz'] : ( 7 == count( $theDate )) ? end( $theDate ) : null;
        if( !empty( $tzid )) {
          $parno = 7;
          if( !$this->_isOffset( $tzid ))
            $params['TZID'] = $tzid; // save only timezone
        }
        elseif( !$parno && ( 3 == count( $theDate )) && 
          ( isset( $params['VALUE'] ) && ( 'DATE' == $params['VALUE'] )))
          $parno = 3;
        else
          $parno = 6;
      }
      else { // string
        $date = trim( $theDate );
        if( 'Z' == substr( $date, -1 ))
          $parno = 7; // UTC DATE-TIME
        elseif((( 8 == strlen( $date ) && ctype_digit( $date )) || ( 11 >= strlen( $date ))) && 
          ( !isset( $params['VALUE'] ) || !in_array( $params['VALUE'], array( 'DATE-TIME', 'PERIOD' ))))
          $parno = 3; // DATE
        $date = $this->_date_time_string( $date, $parno );
        if( !empty( $date['tz'] )) {
          $parno = 7;
          if( !$this->_isOffset( $date['tz'] ))
            $params['TZID'] = $date['tz']; // save only timezone
        }
        elseif( empty( $parno ))
          $parno = 6;
      }
      if( isset( $params['TZID'] ))
        $parno = 6;
    }
  }
/**
 * convert local startdate/enddate (Ymd[His]) to duration
 *
 * uses this component dates if missing input dates
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.11 - 2007-11-03
 * @param array $startdate, optional
 * @param array $duration, optional
 * @return array duration
 */
  function _date2duration( $startdate=FALSE, $enddate=FALSE ) {
    if( !$startdate || !$enddate ) {
      if(   FALSE === ( $startdate = $this->getProperty( 'dtstart' )))
        return null;
      if(   FALSE === ( $enddate   = $this->getProperty( 'dtend' )))    // vevent/vfreebusy
        if( FALSE === ( $enddate   = $this->getProperty( 'due' )))      // vtodo
          return null;
    }
    if( !$startdate || !$enddate )
      return null;
    $startWdate  = mktime( 0, 0, 0, $startdate['month'], $startdate['day'], $startdate['year'] );
    $endWdate    = mktime( 0, 0, 0, $enddate['month'],   $enddate['day'],   $enddate['year'] );
    $wduration   = $endWdate - $startWdate;
    $dur         = array();
    $dur['week'] = (int) floor( $wduration / ( 7 * 24 * 60 * 60 ));
    $wduration   =              $wduration % ( 7 * 24 * 60 * 60 );
    $dur['day']  = (int) floor( $wduration / ( 24 * 60 * 60 ));
    $wduration   =              $wduration % ( 24 * 60 * 60 );
    $dur['hour'] = (int) floor( $wduration / ( 60 * 60 ));
    $wduration   =              $wduration % ( 60 * 60 );
    $dur['min']  = (int) floor( $wduration / ( 60 ));
    $dur['sec']  = (int)        $wduration % ( 60 );
    return $dur;
  }
/**
 * convert date/datetime to timestamp
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-30
 * @param array  $datetime  datetime/(date)
 * @param string $tz        timezone
 * @return timestamp
 */
  function _date2timestamp( $datetime, $tz=null ) {
    $output = null;
    if( !isset( $datetime['hour'] )) $datetime['hour'] = '0';
    if( !isset( $datetime['min'] ))  $datetime['min']  = '0';
    if( !isset( $datetime['sec'] ))  $datetime['sec']  = '0';
    foreach( $datetime as $dkey => $dvalue ) {
      if( 'tz' != $dkey )
        $datetime[$dkey] = (integer) $dvalue;
    }
    if( $tz )
      $datetime['tz'] = $tz;
    $offset = ( isset( $datetime['tz'] ) && ( '' < trim ( $datetime['tz'] ))) ? $this->_tz2offset( $datetime['tz'] ) : 0;
    $output = mktime( $datetime['hour'], $datetime['min'], ($datetime['sec'] + $offset), $datetime['month'], $datetime['day'], $datetime['year'] );
    return $output;
  }
/**
 * ensures internal date-time/date format for input date-time/date in array format
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.3.0 - 2006-08-15
 * @param array $datetime
 * @param int $parno optional, default FALSE
 * @return array
 */
  function _date_time_array( $datetime, $parno=FALSE ) {
    $output = array();
    foreach( $datetime as $dateKey => $datePart ) {
      switch ( $dateKey ) {
        case '0': case 'year':   $output['year']  = $datePart; break;
        case '1': case 'month':  $output['month'] = $datePart; break;
        case '2': case 'day':    $output['day']   = $datePart; break;
      }
      if( 3 != $parno ) {
        switch ( $dateKey ) {
          case '0':
          case '1':
          case '2': break;
          case '3': case 'hour': $output['hour']  = $datePart; break;
          case '4': case 'min' : $output['min']   = $datePart; break;
          case '5': case 'sec' : $output['sec']   = $datePart; break;
          case '6': case 'tz'  : $output['tz']    = $datePart; break;
        }
      }
    }
    if( 3 != $parno ) {
      if( !isset( $output['hour'] ))
        $output['hour'] = 0;
      if( !isset( $output['min']  ))
        $output['min'] = 0;
      if( !isset( $output['sec']  ))
        $output['sec'] = 0;
    }
    return $output;
  }
/**
 * ensures internal date-time/date format for input date-time/date in string fromat
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.10 - 2007-10-19
 * @param array $datetime
 * @param int $parno optional, default FALSE
 * @return array
 */
  function _date_time_string( $datetime, $parno=FALSE ) {
    $datetime = (string) trim( $datetime );
    $tz  = null;
    $len = strlen( $datetime ) - 1;
    if( 'Z' == substr( $datetime, -1 )) {
      $tz = 'Z';
      $datetime = trim( substr( $datetime, 0, $len ));
    }
    elseif( ( ctype_digit( substr( $datetime, -2, 2 ))) && // time or date
                  ( '-' == substr( $datetime, -3, 1 )) ||
                  ( ':' == substr( $datetime, -3, 1 )) ||
                  ( '.' == substr( $datetime, -3, 1 ))) {
      $continue = TRUE;
    }
    elseif( ( ctype_digit( substr( $datetime, -4, 4 ))) && // 4 pos offset
            ( ' +' == substr( $datetime, -6, 2 )) ||
            ( ' -' == substr( $datetime, -6, 2 ))) {
      $tz = substr( $datetime, -5, 5 );
      $datetime = substr( $datetime, 0, ($len - 5));
    }
    elseif( ( ctype_digit( substr( $datetime, -6, 6 ))) && // 6 pos offset
            ( ' +' == substr( $datetime, -8, 2 )) ||
            ( ' -' == substr( $datetime, -8, 2 ))) {
      $tz = substr( $datetime, -7, 7 );
      $datetime = substr( $datetime, 0, ($len - 7));
    }
    elseif( ( 6 < $len ) && ( ctype_digit( substr( $datetime, -6, 6 )))) {
      $continue = TRUE;
    }
    elseif( 'T' ==  substr( $datetime, -7, 1 )) {
      $continue = TRUE;
    }
    else {
      $cx  = $tx = 0;    //  19970415T133000 US-Eastern
      for( $cx = -1; $cx > ( 9 - $len ); $cx-- ) {
        if(( ' ' == substr( $datetime, $cx, 1 )) || ctype_digit( substr( $datetime, $cx, 1 )))
          break; // if exists, tz ends here.. . ?
        elseif( ctype_alpha( substr( $datetime, $cx, 1 )) ||
             ( in_array( substr( $datetime, $cx, 1 ), array( '-', '/' ))))
          $tx--; // tz length counter
      }
      if( 0 > $tx ) {
        $tz = substr( $datetime, $tx );
        $datetime = trim( substr( $datetime, 0, $len + $tx + 1 ));
      }
    }
    if( 0 < substr_count( $datetime, '-' )) {
      $datetime = str_replace( '-', '/', $datetime );
    }
    elseif( ctype_digit( substr( $datetime, 0, 8 )) &&
           ( 'T' ==      substr( $datetime, 8, 1 )) &&
            ctype_digit( substr( $datetime, 9, 6 ))) {
      $datetime = substr( $datetime,  4, 2 )
             .'/'.substr( $datetime,  6, 2 )
             .'/'.substr( $datetime,  0, 4 )
             .' '.substr( $datetime,  9, 2 )
             .':'.substr( $datetime, 11, 2 )
             .':'.substr( $datetime, 13);
    }
    $datestring = date( 'Y-m-d H:i:s', strtotime( $datetime ));
    $tz                = trim( $tz );
    $output            = array();
    $output['year']    = substr( $datestring, 0, 4 );
    $output['month']   = substr( $datestring, 5, 2 );
    $output['day']     = substr( $datestring, 8, 2 );
    if(( 6 == $parno ) || ( 7 == $parno )) {
      $output['hour']  = substr( $datestring, 11, 2 );
      $output['min']   = substr( $datestring, 14, 2 );
      $output['sec']   = substr( $datestring, 17, 2 );
      if( !empty( $tz ))
        $output['tz']  = $tz;
    }
    elseif( 3 != $parno ) {
      if(( '00' < substr( $datestring, 11, 2 )) ||
         ( '00' < substr( $datestring, 14, 2 )) ||
         ( '00' < substr( $datestring, 17, 2 ))) {
        $output['hour']  = substr( $datestring, 11, 2 );
        $output['min']   = substr( $datestring, 14, 2 );
        $output['sec']   = substr( $datestring, 17, 2 );
      }
      if( !empty( $tz ))
        $output['tz']  = $tz;
    }
    return $output;
  }
/**
 * ensures internal duration format for input in array format
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.1.1 - 2007-06-24
 * @param array $duration
 * @return array
 */
  function _duration_array( $duration ) {
    $output = array();
    if(    is_array( $duration )        &&
       ( 1 == count( $duration ))       &&
              isset( $duration['sec'] ) &&
              ( 60 < $duration['sec'] )) {
      $durseconds  = $duration['sec'];
      $output['week'] = floor( $durseconds / ( 60 * 60 * 24 * 7 ));
      $durseconds  =           $durseconds % ( 60 * 60 * 24 * 7 );
      $output['day']  = floor( $durseconds / ( 60 * 60 * 24 ));
      $durseconds  =           $durseconds % ( 60 * 60 * 24 );
      $output['hour'] = floor( $durseconds / ( 60 * 60 ));
      $durseconds  =           $durseconds % ( 60 * 60 );
      $output['min']  = floor( $durseconds / ( 60 ));
      $output['sec']  =      ( $durseconds % ( 60 ));
    }
    else {
      foreach( $duration as $durKey => $durValue ) {
        if( empty( $durValue )) continue;
        switch ( $durKey ) {
          case '0': case 'week': $output['week']  = $durValue; break;
          case '1': case 'day':  $output['day']   = $durValue; break;
          case '2': case 'hour': $output['hour']  = $durValue; break;
          case '3': case 'min':  $output['min']   = $durValue; break;
          case '4': case 'sec':  $output['sec']   = $durValue; break;
        }
      }
    }
    if( isset( $output['week'] ) && ( 0 < $output['week'] )) {
      unset( $output['day'], $output['hour'], $output['min'], $output['sec'] );
      return $output;
    }
    unset( $output['week'] );
    if( empty( $output['day'] ))
      unset( $output['day'] );
    if ( isset( $output['hour'] ) || isset( $output['min'] ) || isset( $output['sec'] )) {
      if( !isset( $output['hour'] )) $output['hour'] = 0;
      if( !isset( $output['min']  )) $output['min']  = 0;
      if( !isset( $output['sec']  )) $output['sec']  = 0;
      if(( 0 == $output['hour'] ) && ( 0 == $output['min'] ) && ( 0 == $output['sec'] ))
        unset( $output['hour'], $output['min'], $output['sec'] );
    }
    return $output;
  }
/**
 * convert duration to date in array format based on input or dtstart value
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-30
 * @param array $startdate, optional
 * @param array $duration, optional
 * @return array, date format
 */
  function duration2date( $startdate=FALSE, $duration=FALSE ) {
    if( $startdate && $duration ) {
      $d1               = $startdate;
      $dur              = $duration;
    }
    elseif( isset( $this->dtstart['value'] ) && isset( $this->duration['value'] )) {
      $d1               = $this->dtstart['value'];
      $dur              = $this->duration['value'];
    }
    else
      return null;
    $dateOnly         = ( isset( $d1['hour'] ) || isset( $d1['min'] ) || isset( $d1['sec'] )) ? FALSE : TRUE;
    $d1['hour']       = ( isset( $d1['hour'] )) ? $d1['hour'] : 0;
    $d1['min']        = ( isset( $d1['min'] ))  ? $d1['min']  : 0;
    $d1['sec']        = ( isset( $d1['sec'] ))  ? $d1['sec']  : 0;
    $dtend = mktime( $d1['hour'], $d1['min'], $d1['sec'], $d1['month'], $d1['day'], $d1['year'] );
    if( isset( $dur['week'] ))
      $dtend += ( $dur['week'] * 7 * 24 * 60 * 60 );
    if( isset( $dur['day'] ))
      $dtend += ( $dur['day'] * 24 * 60 * 60 );
    if( isset( $dur['hour'] ))
      $dtend += ( $dur['hour'] * 60 *60 );
    if( isset( $dur['min'] ))
      $dtend += ( $dur['min'] * 60 );
    if( isset( $dur['sec'] ))
      $dtend +=   $dur['sec'];
    $dtend2 = array();
    $dtend2['year']   = date('Y', $dtend );
    $dtend2['month']  = date('m', $dtend );
    $dtend2['day']    = date('d', $dtend );
    $dtend2['hour']   = date('H', $dtend );
    $dtend2['min']    = date('i', $dtend );
    $dtend2['sec']    = date('s', $dtend );
    if( isset( $d1['tz'] ))
      $dtend2['tz']   = $d1['tz'];
    if( $dateOnly && (( 0 == $dtend2['hour'] ) && ( 0 == $dtend2['min'] ) && ( 0 == $dtend2['sec'] )))
      unset( $dtend2['hour'], $dtend2['min'], $dtend2['sec'] );
    return $dtend2;
  }
/**
 * ensures internal duration format for input in string format
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.0.5 - 2007-03-14
 * @param string $duration
 * @return array
 */
  function _duration_string( $duration ) {
   $duration = (string) trim( $duration );
   while( 'P' != strtoupper( substr( $duration, 0, 1 ))) {
     if( 0 < strlen( $duration ))
       $duration = substr( $duration, 1 );
     else
       return false; // no leading P !?!?
   }
   $duration = substr( $duration, 1 ); // skip P
   $duration = str_replace ( 't', 'T', $duration );
   $duration = str_replace ( 'T', '', $duration );
   $output = array();
   $val    = null;
   for( $ix=0; $ix < strlen( $duration ); $ix++ ) {
     switch( strtoupper( $duration{$ix} )) {
      case 'W':
        $output['week'] = $val;
        $val            = null;
        break;
      case 'D':
        $output['day']  = $val;
        $val            = null;
        break;
      case 'H':
        $output['hour'] = $val;
        $val            = null;
        break;
      case 'M':
        $output['min']  = $val;
        $val            = null;
        break;
      case 'S':
        $output['sec']  = $val;
        $val            = null;
        break;
      default:
        if( !ctype_digit( $duration{$ix} ))
          return false; // unknown duration controll character  !?!?
        else
          $val .= $duration{$ix};
     }
   }
   return $this->_duration_array( $output );
  }
/**
 * if not preSet, if exist, remove key with expected value from array and return hit value else return elseValue
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-11-08
 * @param array $array
 * @param string $expkey, expected key
 * @param string $expval, expected value
 * @param int $hitVal optional, return value if found
 * @param int $elseVal optional, return value if not found
 * @param int $preSet optional, return value if already preset
 * @return int
 */
  function _existRem( &$array, $expkey, $expval=FALSE, $hitVal=null, $elseVal=null, $preSet=null ) {
    if( $preSet )
      return $preSet;
    if( !is_array( $array ) || ( 0 == count( $array )))
      return $elseVal;
    foreach( $array as $key => $value ) {
      if( strtoupper( $expkey ) == strtoupper( $key )) {
        if( !$expval || ( strtoupper( $expval ) == strtoupper( $array[$key] ))) {
          unset( $array[$key] );
          return $hitVal;
        }
      }
    }
    return $elseVal;
  }
/**
 * creates formatted output for calendar component property data value type date/date-time
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-30
 * @param array   $datetime
 * @param int     $parno, optional, default 6
 * @return string
 */
  function _format_date_time( $datetime, $parno=6 ) {
    if( !isset( $datetime['year'] )  &&
        !isset( $datetime['month'] ) &&
        !isset( $datetime['day'] )   &&
        !isset( $datetime['hour'] )  &&
        !isset( $datetime['min'] )   &&
        !isset( $datetime['sec'] ))
      return ;
    $output = null;
    // if( !isset( $datetime['day'] )) { $o=''; foreach($datetime as $k=>$v) {if(is_array($v)) $v=implode('-',$v);$o.=" $k=>$v";} echo " day SAKNAS : $o <br />\n"; }
    foreach( $datetime as $dkey => $dvalue ) {
      if( 'tz' != $dkey )
        $datetime[$dkey] = (integer) $dvalue;
    }
    $output = date('Ymd', mktime( 0, 0, 0, $datetime['month'], $datetime['day'], $datetime['year']));
    if( isset( $datetime['hour'] )  ||
        isset( $datetime['min'] )   ||
        isset( $datetime['sec'] )   ||
        isset( $datetime['tz'] )) {
      if( isset( $datetime['tz'] )  &&
         !isset( $datetime['hour'] ))
        $datetime['hour'] = 0;
      if( isset( $datetime['hour'] )  &&
         !isset( $datetime['min'] ))
        $datetime['min'] = 0;
      if( isset( $datetime['hour'] )  &&
          isset( $datetime['min'] )   &&
         !isset( $datetime['sec'] ))
        $datetime['sec'] = 0;
      $date = mktime( $datetime['hour'], $datetime['min'], $datetime['sec'], $datetime['month'], $datetime['day'], $datetime['year']);
      $output .= date('\THis', $date );
      if( isset( $datetime['tz'] ) && ( '' < trim ( $datetime['tz'] ))) {
        $datetime['tz'] = trim( $datetime['tz'] );
        if( 'Z' == $datetime['tz'] )
          $output .= 'Z';
        $offset = $this->_tz2offset( $datetime['tz'] );
        if( 0 != $offset ) {
          $date = mktime( $datetime['hour'], $datetime['min'], ($datetime['sec'] + $offset), $datetime['month'], $datetime['day'], $datetime['year']);
          $output    = date( 'Ymd\THis\Z', $date );
        }
      }
      elseif( 7 == $parno )
        $output .= 'Z';
    }
    return $output;
  }
/**
 * creates formatted output for calendar component property data value type duration
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-10
 * @param array $duration ( week, day, hour, min, sec )
 * @return string
 */
  function _format_duration( $duration ) {
    if( !isset( $duration['week'] ) &&
        !isset( $duration['day'] )  &&
        !isset( $duration['hour'] ) &&
        !isset( $duration['min'] )  &&
        !isset( $duration['sec'] ))
      return;
    $output = 'P';
    if( isset( $duration['week'] ) && ( 0 < $duration['week'] ))
      $output   .= $duration['week'].'W';
    else {
      if( isset($duration['day'] ) && ( 0 < $duration['day'] ))
        $output .= $duration['day'].'D';
      if(( isset( $duration['hour']) && ( 0 < $duration['hour'] )) ||
         ( isset( $duration['min'])  && ( 0 < $duration['min'] ))  ||
         ( isset( $duration['sec'])  && ( 0 < $duration['sec'] ))) {
        $output .= 'T';
        $output .= ( isset( $duration['hour']) && ( 0 < $duration['hour'] )) ? $duration['hour'].'H' : '0H';
        $output .= ( isset( $duration['min'])  && ( 0 < $duration['min'] ))  ? $duration['min']. 'M' : '0M';
        $output .= ( isset( $duration['sec'])  && ( 0 < $duration['sec'] ))  ? $duration['sec']. 'S' : '0S';
      }
    }
    return $output;
  }
/**
 * creates formatted output for calendar component property data value type recur
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-22
 * @param array $recurlabel
 * @param array $recurdata
 * @return string
 */
  function _format_recur( $recurlabel, $recurdata ) {
    $output = null;
    foreach( $recurdata as $therule ) {
      if( empty( $therule['value'] )) {
        if( $this->getConfig( 'allowEmpty' )) $output .= $this->_createElement( $recurlabel );
        continue;
      }
      $attributes = ( isset( $therule['params'] )) ? $this->_createParams( $therule['params'] ) : null;
      $content1  = $content2  = null;
      foreach( $therule['value'] as $rulelabel => $rulevalue ) {
        switch( $rulelabel ) {
          case 'FREQ': {
            $content1 .= "FREQ=$rulevalue";
            break;
          }
          case 'UNTIL': {
            $content2 .= ";UNTIL=";
            $content2 .= $this->_format_date_time( $rulevalue );
            break;
          }
          case 'COUNT':
          case 'INTERVAL':
          case 'WKST': {
            $content2 .= ";$rulelabel=$rulevalue";
            break;
          }
          case 'BYSECOND':
          case 'BYMINUTE':
          case 'BYHOUR':
          case 'BYMONTHDAY':
          case 'BYYEARDAY':
          case 'BYWEEKNO':
          case 'BYMONTH':
          case 'BYSETPOS': {
            $content2 .= ";$rulelabel=";
            if( is_array( $rulevalue )) {
              foreach( $rulevalue as $vix => $valuePart ) {
                $content2 .= ( $vix ) ? ',' : null;
                $content2 .= $valuePart;
              }
            }
            else
             $content2 .= $rulevalue;
            break;
          }
          case 'BYDAY': {
            $content2 .= ";$rulelabel=";
            $bydaycnt = 0;
            foreach( $rulevalue as $vix => $valuePart ) {
              $content21 = $content22 = null;
              if( is_array( $valuePart )) {
                $content2 .= ( $bydaycnt ) ? ',' : null;
                foreach( $valuePart as $vix2 => $valuePart2 ) {
                  if( 'DAY' != strtoupper( $vix2 ))
                      $content21 .= $valuePart2;
                  else
                    $content22 .= $valuePart2;
                }
                $content2 .= $content21.$content22;
                $bydaycnt++;
              }
              else {
                $content2 .= ( $bydaycnt ) ? ',' : null;
                if( 'DAY' != strtoupper( $vix ))
                    $content21 .= $valuePart;
                else {
                  $content22 .= $valuePart;
                  $bydaycnt++;
                }
                $content2 .= $content21.$content22;
              }
            }
            break;
          }
          default: {
            $content2 .= ";$rulelabel=$rulevalue";
            break;
          }
        }
      }
      $output .= $this->_createElement( $recurlabel, $attributes, $content1.$content2 );
    }
    return $output;
  }
/**
 * create property name case - lower/upper
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-20
 * @param string $propertyName
 * @return string
 */
  function _formatPropertyName( $propertyName ) {
    switch( $this->format ) {
      case 'xcal':
        return strtolower( $propertyName );
        break;
      default:
        return strtoupper( $propertyName );
        break;
    }
  }
/**
 * checks if input array contains a date
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-25
 * @param array $input
 * @return bool
 */
  function _isArrayDate( $input ) {
    if( isset( $input['week'] ) || ( !in_array( count( $input ), array( 3, 6, 7 ))))
      return FALSE;
    if( 7 == count( $input ))
      return TRUE;
    if( isset( $input['year'] ) && isset( $input['month'] ) && isset( $input['day'] ))
      return checkdate( (int) $input['month'], (int) $input['day'], (int) $input['year'] );
    if( isset( $input['day'] ) || isset( $input['hour'] ) || isset( $input['min'] ) || isset( $input['sec'] ))
      return FALSE;
    if( in_array( 0, $input ))
      return FALSE;
    if(( 1970 > $input[0] ) || ( 12 < $input[1] ) || ( 31 < $input[2] ))
      return FALSE;
    if(( isset( $input[0] ) && isset( $input[1] ) && isset( $input[2] )) &&
         checkdate( (int) $input[1], (int) $input[2], (int) $input[0] ))
      return TRUE;
    $input = $this->_date_time_string( $input[1].'/'.$input[2].'/'.$input[0], 3 ); //  m - d - Y
    if( isset( $input['year'] ) && isset( $input['month'] ) && isset( $input['day'] ))
      return checkdate( (int) $input['month'], (int) $input['day'], (int) $input['year'] );
    return FALSE;
  }
/**
 * checks if input array contains a timestamp date
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-18
 * @param array $input
 * @return bool
 */
  function _isArrayTimestampDate( $input ) {
    return ( is_array( $input ) && isset( $input['timestamp'] )) ? TRUE : FALSE ;
  }
/**
 * controll if input string contains traling UTC offset
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-19
 * @param string $input
 * @return bool
 */
  function _isOffset( $input ) {
    $input         = trim( (string) $input );
    if( 'Z' == substr( $input, -1 ))
      return TRUE;
    elseif((   5 <= strlen( $input )) &&
       ( in_array( substr( $input, -5, 1 ), array( '+', '-' ))) &&
       (   '0000'  < substr( $input, -4 )) && (   '9999' >= substr( $input, -4 )))
      return TRUE;
    elseif((    7 <= strlen( $input )) &&
       ( in_array( substr( $input, -7, 1 ), array( '+', '-' ))) &&
       ( '000000'  < substr( $input, -6 )) && ( '999999' >= substr( $input, -6 )))
      return TRUE;
    return FALSE;

  }
/**
 * check if property not exists within component
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-15
 * @param string $propName
 * @return bool
 */
  function _notExistProp( $propName ) {
    if( empty( $propName )) return FALSE; // when deleting x-prop, an empty propName may be used=allowed
    $propName = strtolower( $propName );
    if(     'last-modified'    == $propName )  { if( !isset( $this->lastmodified ))    return TRUE; }
    elseif( 'percent-complete' == $propName )  { if( !isset( $this->percentcomplete )) return TRUE; }
    elseif( 'recurrence-id'    == $propName )  { if( !isset( $this->recurrenceid ))    return TRUE; }
    elseif( 'related-to'       == $propName )  { if( !isset( $this->relatedto ))       return TRUE; }
    elseif( 'request-status'   == $propName )  { if( !isset( $this->requeststatus ))   return TRUE; }
    elseif((       'x-' != substr($propName,0,2)) && !isset( $this->$propName ))       return TRUE;
    return FALSE;
  }
/**
 * remakes a recur pattern to an array of dates
 *
 * if missing, UNTIL is set 1 year from startdate (emergency break)
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-18
 * @param array $result, array to update, array([timestamp] => timestamp)
 * @param array $recur, pattern for recurrency (only value part, params ignored)
 * @param array $wdate, component start date
 * @param array $startdate, start date
 * @param array $enddate, optional
 * @return array of recurrence (start-)dates as index
 * @todo BYHOUR, BYMINUTE, BYSECOND, ev. BYSETPOS due to ambiguity, WEEKLY at year end/start
 */
  function _recur2date( & $result, $recur, $wdate, $startdate, $enddate=FALSE ) {
    foreach( $wdate as $k => $v ) if( ctype_digit( $v )) $wdate[$k] = (int) $v;
    $wdatets     = $this->_date2timestamp( $wdate );
    $startdatets = $this->_date2timestamp( $startdate );
    if( !$enddate ) {
      $enddate = $startdate;
      $enddate['year'] += 1;
// echo "recur __in_ ".implode('-',$startdate)." period start ".implode('-',$wdate)." period end ".implode('-',$enddate)."<br />\n";print_r($recur);echo "<br />\n";//test###
    }
    $endDatets = $this->_date2timestamp( $enddate ); // fix break
    if( !isset( $recur['COUNT'] ) && !isset( $recur['UNTIL'] ))
      $recur['UNTIL'] = $enddate; // create break
    if( isset( $recur['UNTIL'] )) {
      $tdatets = $this->_date2timestamp( $recur['UNTIL'] );
      if( $endDatets > $tdatets ) {
        $endDatets = $tdatets; // emergency break
        $enddate   = $this->_timestamp2date( $endDatets, 6 );
      }
      else
        $recur['UNTIL'] = $this->_timestamp2date( $endDatets, 6 );
    }
    if( $wdatets > $endDatets ) {
     //echo "recur out of date ".implode('-',$this->_date_time_string(date('Y-m-d H:i:s',$wdatets),6))."<br />\n";//test
      return array(); // nothing to do.. .
    }
    if( !isset( $recur['FREQ'] )) // "MUST be specified.. ."
      $recur['FREQ'] = 'DAILY'; // ??
    $wkst = ( isset( $recur['WKST'] ) && ( 'SU' == $recur['WKST'] )) ? 24*60*60 : 0; // ??
    if( !isset( $recur['INTERVAL'] ))
      $recur['INTERVAL'] = 1;
    $countcnt = ( !isset( $recur['BYSETPOS'] )) ? 1 : 0; // DTSTART counts as the first occurrence
            /* find out how to step up dates and set index for interval count */
    $step = array();
    if( 'YEARLY' == $recur['FREQ'] )
      $step['year']  = 1;
    elseif( 'MONTHLY' == $recur['FREQ'] )
      $step['month'] = 1;
    elseif( 'WEEKLY' == $recur['FREQ'] )
      $step['day']   = 7;
    else
      $step['day']   = 1;
    if( isset( $step['year'] ) && isset( $recur['BYMONTH'] ))
      $step = array( 'month' => 1 );
    if( empty( $step ) && isset( $recur['BYWEEKNO'] )) // ??
      $step = array( 'day' => 7 );
    if( isset( $recur['BYYEARDAY'] ) || isset( $recur['BYMONTHDAY'] ) || isset( $recur['BYDAY'] ))
      $step = array( 'day' => 1 );
    $intervalarr = array();
    if( 1 < $recur['INTERVAL'] ) {
      $intervalix = $this->_recurIntervalIx( $recur['FREQ'], $wdate, $wkst );
      $intervalarr = array( $intervalix => 0 );
    }
    if( isset( $recur['BYSETPOS'] )) { // save start date + weekno
      $bysetposymd1 = $bysetposymd2 = $bysetposw1 = $bysetposw2 = array();
      $bysetposWold = (int) date( 'W', ( $wdatets + $wkst ));
      $bysetposYold = $wdate['year'];
      $bysetposMold = $wdate['month'];
      $bysetposDold = $wdate['day'];
      if( is_array( $recur['BYSETPOS'] )) {
        foreach( $recur['BYSETPOS'] as $bix => $bval )
          $recur['BYSETPOS'][$bix] = (int) $bval;
      }
      else
        $recur['BYSETPOS'] = array( (int) $recur['BYSETPOS'] );
      $this->_stepdate( $enddate, $endDatets, $step); // make sure to count whole last period
    }
    $this->_stepdate( $wdate, $wdatets, $step);
    $year_old     = null;
    $daynames     = array( 'SU', 'MO', 'TU', 'WE', 'TH', 'FR', 'SA' );
             /* MAIN LOOP */
     // echo "recur start ".implode('-',$wdate)." end ".implode('-',$enddate)."<br />\n";//test
    while( TRUE ) {
      if( isset( $endDatets ) && ( $wdatets > $endDatets ))
        break;
      if( isset( $recur['COUNT'] ) && ( $countcnt >= $recur['COUNT'] ))
        break;
      if( $year_old != $wdate['year'] ) {
        $year_old   = $wdate['year'];
        $daycnts    = array();
        $yeardays   = $weekno = 0;
        $yeardaycnt = array();
        for( $m = 1; $m <= 12; $m++ ) { // count up and update up-counters
          $daycnts[$m] = array();
          $weekdaycnt = array();
          foreach( $daynames as $dn )
            $yeardaycnt[$dn] = $weekdaycnt[$dn] = 0;
          $mcnt     = date( 't', mktime( 0, 0, 0, $m, 1, $wdate['year'] ));
          for( $d   = 1; $d <= $mcnt; $d++ ) {
            $daycnts[$m][$d] = array();
            if( isset( $recur['BYYEARDAY'] )) {
              $yeardays++;
              $daycnts[$m][$d]['yearcnt_up'] = $yeardays;
            }
            if( isset( $recur['BYDAY'] )) {
              $day    = date( 'w', mktime( 0, 0, 0, $m, $d, $wdate['year'] ));
              $day    = $daynames[$day];
              $daycnts[$m][$d]['DAY'] = $day;
              $weekdaycnt[$day]++;
              $daycnts[$m][$d]['monthdayno_up'] = $weekdaycnt[$day];
              $yeardaycnt[$day]++;
              $daycnts[$m][$d]['yeardayno_up'] = $yeardaycnt[$day];
            }
            if(  isset( $recur['BYWEEKNO'] ) || ( $recur['FREQ'] == 'WEEKLY' ))
              $daycnts[$m][$d]['weekno_up'] =(int)date('W',mktime(0,0,$wkst,$m,$d,$wdate['year']));
          }
        }
        $daycnt = 0;
        $yeardaycnt = array();
        if(  isset( $recur['BYWEEKNO'] ) || ( $recur['FREQ'] == 'WEEKLY' )) {
          $weekno = null;
          for( $d=31; $d > 25; $d-- ) { // get last weekno for year
            if( !$weekno )
              $weekno = $daycnts[12][$d]['weekno_up'];
            elseif( $weekno < $daycnts[12][$d]['weekno_up'] ) {
              $weekno = $daycnts[12][$d]['weekno_up'];
              break;
            }
          }
        }
        for( $m = 12; $m > 0; $m-- ) { // count down and update down-counters
          $weekdaycnt = array();
          foreach( $daynames as $dn )
            $yeardaycnt[$dn] = $weekdaycnt[$dn] = 0;
          $monthcnt = 0;
          $mcnt     = date( 't', mktime( 0, 0, 0, $m, 1, $wdate['year'] ));
          for( $d   = $mcnt; $d > 0; $d-- ) {
            if( isset( $recur['BYYEARDAY'] )) {
              $daycnt -= 1;
              $daycnts[$m][$d]['yearcnt_down'] = $daycnt;
            }
            if( isset( $recur['BYMONTHDAY'] )) {
              $monthcnt -= 1;
              $daycnts[$m][$d]['monthcnt_down'] = $monthcnt;
            }
            if( isset( $recur['BYDAY'] )) {
              $day  = $daycnts[$m][$d]['DAY'];
              $weekdaycnt[$day] -= 1;
              $daycnts[$m][$d]['monthdayno_down'] = $weekdaycnt[$day];
              $yeardaycnt[$day] -= 1;
              $daycnts[$m][$d]['yeardayno_down'] = $yeardaycnt[$day];
            }
            if(  isset( $recur['BYWEEKNO'] ) || ( $recur['FREQ'] == 'WEEKLY' ))
              $daycnts[$m][$d]['weekno_down'] = ($daycnts[$m][$d]['weekno_up'] - $weekno - 1);
          }
        }
      }
            /* check interval */
      if( 1 < $recur['INTERVAL'] ) {
            /* create interval index */
        $intervalix = $this->_recurIntervalIx( $recur['FREQ'], $wdate, $wkst );
            /* check interval */
        $currentKey = array_keys( $intervalarr );
        $currentKey = end( $currentKey ); // get last index
        if( $currentKey != $intervalix )
          $intervalarr = array( $intervalix => ( $intervalarr[$currentKey] + 1 ));
        if(( $recur['INTERVAL'] != $intervalarr[$intervalix] ) &&
           ( 0 != $intervalarr[$intervalix] )) {
            /* step up date */
    //echo "skip: ".implode('-',$wdate)." ix=$intervalix old=$currentKey interval=".$intervalarr[$intervalix]."<br />\n";//test
          $this->_stepdate( $wdate, $wdatets, $step);
          continue;
        }
        else // continue within the selected interval
          $intervalarr[$intervalix] = 0;
   //echo "cont: ".implode('-',$wdate)." ix=$intervalix old=$currentKey interval=".$intervalarr[$intervalix]."<br />\n";//test
      }
      $updateOK = TRUE;
      if( $updateOK && isset( $recur['BYMONTH'] ))
        $updateOK = $this->_recurBYcntcheck( $recur['BYMONTH']
                                           , $wdate['month']
                                           ,($wdate['month'] - 13));
      if( $updateOK && isset( $recur['BYWEEKNO'] ))
        $updateOK = $this->_recurBYcntcheck( $recur['BYWEEKNO']
                                           , $daycnts[$wdate['month']][$wdate['day']]['weekno_up']
                                           , $daycnts[$wdate['month']][$wdate['day']]['weekno_down'] );
      if( $updateOK && isset( $recur['BYYEARDAY'] ))
        $updateOK = $this->_recurBYcntcheck( $recur['BYYEARDAY']
                                           , $daycnts[$wdate['month']][$wdate['day']]['yearcnt_up']
                                           , $daycnts[$wdate['month']][$wdate['day']]['yearcnt_down'] );
      if( $updateOK && isset( $recur['BYMONTHDAY'] ))
        $updateOK = $this->_recurBYcntcheck( $recur['BYMONTHDAY']
                                           , $wdate['day']
                                           , $daycnts[$wdate['month']][$wdate['day']]['monthcnt_down'] );
    //echo "efter BYMONTHDAY: ".implode('-',$wdate).' status: '; echo ($updateOK) ? 'TRUE' : 'FALSE'; echo "<br />\n";//test###
      if( $updateOK && isset( $recur['BYDAY'] )) {
        $updateOK = FALSE;
        $m = $wdate['month'];
        $d = $wdate['day'];
        if( isset( $recur['BYDAY']['DAY'] )) { // single day, opt with year/month day order no
          $daynoexists = $daynosw = $daynamesw =  FALSE;
          if( $recur['BYDAY']['DAY'] == $daycnts[$m][$d]['DAY'] )
            $daynamesw = TRUE;
          if( isset( $recur['BYDAY'][0] )) {
            $daynoexists = TRUE;
            if(( isset( $recur['FREQ'] ) && ( $recur['FREQ'] == 'MONTHLY' )) || isset( $recur['BYMONTH'] ))
              $daynosw = $this->_recurBYcntcheck( $recur['BYDAY'][0]
                                                , $daycnts[$m][$d]['monthdayno_up']
                                                , $daycnts[$m][$d]['monthdayno_down'] );
            elseif( isset( $recur['FREQ'] ) && ( $recur['FREQ'] == 'YEARLY' ))
              $daynosw = $this->_recurBYcntcheck( $recur['BYDAY'][0]
                                                , $daycnts[$m][$d]['yeardayno_up']
                                                , $daycnts[$m][$d]['yeardayno_down'] );
          }
          if((  $daynoexists &&  $daynosw && $daynamesw ) ||
             ( !$daynoexists && !$daynosw && $daynamesw )) {
            $updateOK = TRUE;
          }
        //echo "daynoexists:$daynoexists daynosw:$daynosw daynamesw:$daynamesw<br />\n"; // test ###
        }
        else {
          foreach( $recur['BYDAY'] as $bydayvalue ) {
            $daynoexists = $daynosw = $daynamesw = FALSE;
            if( isset( $bydayvalue['DAY'] ) &&
                     ( $bydayvalue['DAY'] == $daycnts[$m][$d]['DAY'] ))
              $daynamesw = TRUE;
            if( isset( $bydayvalue[0] )) {
              $daynoexists = TRUE;
              if(( isset( $recur['FREQ'] ) && ( $recur['FREQ'] == 'MONTHLY' )) ||
                   isset( $recur['BYMONTH'] ))
                $daynosw = $this->_recurBYcntcheck( $bydayvalue['0']
                                                  , $daycnts[$m][$d]['monthdayno_up']
                                                  , $daycnts[$m][$d]['monthdayno_down'] );
              elseif( isset( $recur['FREQ'] ) && ( $recur['FREQ'] == 'YEARLY' ))
                $daynosw = $this->_recurBYcntcheck( $bydayvalue['0']
                                                  , $daycnts[$m][$d]['yeardayno_up']
                                                  , $daycnts[$m][$d]['yeardayno_down'] );
            }
        //echo "daynoexists:$daynoexists daynosw:$daynosw daynamesw:$daynamesw<br />\n"; // test ###
            if((  $daynoexists &&  $daynosw && $daynamesw ) ||
               ( !$daynoexists && !$daynosw && $daynamesw )) {
              $updateOK = TRUE;
              break;
            }
          }
        }
      }
      //echo "efter BYDAY: ".implode('-',$wdate).' status: '; echo ($updateOK) ? 'TRUE' : 'FALSE'; echo "<br />\n"; // test ###
            /* check BYSETPOS */
      if( $updateOK ) {
        if( isset( $recur['BYSETPOS'] ) &&
          ( in_array( $recur['FREQ'], array( 'YEARLY', 'MONTHLY', 'WEEKLY', 'DAILY' )))) {
          if( isset( $recur['WEEKLY'] )) {
            if( $bysetposWold == $daycnts[$wdate['month']][$wdate['day']]['weekno_up'] )
              $bysetposw1[] = $wdatets;
            else
              $bysetposw2[] = $wdatets;
          }
          else {
            if(( isset( $recur['FREQ'] ) && ( 'YEARLY'      == $recur['FREQ'] )  &&
                                            ( $bysetposYold == $wdate['year'] ))   ||
               ( isset( $recur['FREQ'] ) && ( 'MONTHLY'     == $recur['FREQ'] )  &&
                                           (( $bysetposYold == $wdate['year'] )  &&
                                            ( $bysetposMold == $wdate['month'] ))) ||
               ( isset( $recur['FREQ'] ) && ( 'MONTHLY'     == $recur['FREQ'] )  &&
                                           (( $bysetposYold == $wdate['year'] )  &&
                                            ( $bysetposMold == $wdate['month'])  &&
                                            ( $bysetposDold == $wdate['sday'] ))))
              $bysetposymd1[] = $wdatets;
            else
              $bysetposymd2[] = $wdatets;
          }
        }
        else {
            /* update result array if BYSETPOS is set */
          $countcnt++;
          if( $startdatets <= $wdatets ) { // only output within period
            $result[$wdatets] = TRUE;
          //echo "recur ".implode('-',$this->_date_time_string(date('Y-m-d H:i:s',$wdatets),6))."<br />\n";//test
          }
         //else echo "recur undate ".implode('-',$this->_date_time_string(date('Y-m-d H:i:s',$wdatets),6))." okdatstart ".implode('-',$this->_date_time_string(date('Y-m-d H:i:s',$startdatets),6))."<br />\n";//test
          $updateOK = FALSE;
        }
      }
            /* step up date */
      $this->_stepdate( $wdate, $wdatets, $step);
            /* check if BYSETPOS is set for updating result array */
      if( $updateOK && isset( $recur['BYSETPOS'] )) {
        $bysetpos       = FALSE;
        if( isset( $recur['FREQ'] ) && ( 'YEARLY'  == $recur['FREQ'] ) &&
          ( $bysetposYold != $wdate['year'] )) {
          $bysetpos     = TRUE;
          $bysetposYold = $wdate['year'];
        }
        elseif( isset( $recur['FREQ'] ) && ( 'MONTHLY' == $recur['FREQ'] &&
         (( $bysetposYold != $wdate['year'] ) || ( $bysetposMold != $wdate['month'] )))) {
          $bysetpos     = TRUE;
          $bysetposYold = $wdate['year'];
          $bysetposMold = $wdate['month'];
        }
        elseif( isset( $recur['FREQ'] ) && ( 'WEEKLY'  == $recur['FREQ'] )) {
          $weekno = (int) date( 'W', mktime( 0, 0, $wkst, $wdate['month'], $wdate['day'], $wdate['year']));
          if( $bysetposWold != $weekno ) {
            $bysetposWold = $weekno;
            $bysetpos     = TRUE;
          }
        }
        elseif( isset( $recur['FREQ'] ) && ( 'DAILY'   == $recur['FREQ'] ) &&
         (( $bysetposYold != $wdate['year'] )  ||
          ( $bysetposMold != $wdate['month'] ) ||
          ( $bysetposDold != $wdate['sday'] ))) {
          $bysetpos     = TRUE;
          $bysetposYold = $wdate['year'];
          $bysetposMold = $wdate['month'];
          $bysetposDold = $wdate['day'];
        }
        if( $bysetpos ) {
          if( isset( $recur['BYWEEKNO'] )) {
            $bysetposarr1 = & $bysetposw1;
            $bysetposarr2 = & $bysetposw2;
          }
          else {
            $bysetposarr1 = & $bysetposymd1;
            $bysetposarr2 = & $bysetposymd2;
          }
          foreach( $recur['BYSETPOS'] as $ix ) {
            if( 0 > $ix ) // both positive and negative BYSETPOS allowed
              $ix = ( count( $bysetposarr1 ) + $ix + 1);
            $ix--;
            if( isset( $bysetposarr1[$ix] )) {
              if( $startdatets <= $bysetposarr1[$ix] ) { // only output within period
                $result[$bysetposarr1[$ix]] = TRUE;
       //echo "recur ".implode('-',$this->_date_time_string(date('Y-m-d H:i:s',$bysetposarr1[$ix]),6))."<br />\n";//test
              }
              $countcnt++;
            }
            if( isset( $recur['COUNT'] ) && ( $countcnt >= $recur['COUNT'] ))
              break;
          }
          $bysetposarr1 = $bysetposarr2;
          $bysetposarr2 = array();
        }
      }
    }
  }
  function _recurBYcntcheck( $BYvalue, $upValue, $downValue ) {
    if( is_array( $BYvalue ) &&
      ( in_array( $upValue, $BYvalue ) || in_array( $downValue, $BYvalue )))
      return TRUE;
    elseif(( $BYvalue == $upValue ) || ( $BYvalue == $downValue ))
      return TRUE;
    else
      return FALSE;
  }
  function _recurIntervalIx( $freq, $date, $wkst ) {
            /* create interval index */
    switch( $freq ) {
      case 'YEARLY':
        $intervalix = $date['year'];
        break;
      case 'MONTHLY':
        $intervalix = $date['year'].'-'.$date['month'];
        break;
      case 'WEEKLY':
        $wdatets    = $this->_date2timestamp( $date );
        $intervalix = (int) date( 'W', ( $wdatets + $wkst ));
       break;
      case 'DAILY':
           default:
        $intervalix = $date['year'].'-'.$date['month'].'-'.$date['day'];
        break;
    }
    return $intervalix;
  }
/**
 * convert input format for exrule and rrule to internal format
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-19
 * @param array $rexrule
 * @return array
 */
  function _setRexrule( $rexrule ) {
    $input          = array();
    if( empty( $rexrule ))
      return $input;
    foreach( $rexrule as $rexrulelabel => $rexrulevalue ) {
      $rexrulelabel = strtoupper( $rexrulelabel );
      if( 'UNTIL'  != $rexrulelabel )
        $input[$rexrulelabel]   = $rexrulevalue;
      else {
        if( $this->_isArrayTimestampDate( $rexrulevalue )) // timestamp date
          $input[$rexrulelabel] = $this->_timestamp2date( $rexrulevalue, 6 );
        elseif( $this->_isArrayDate( $rexrulevalue )) // date-time
          $input[$rexrulelabel] = $this->_date_time_array( $rexrulevalue, 6 );
        elseif( 8 <= strlen( trim( $rexrulevalue ))) // ex. 2006-08-03 10:12:18
          $input[$rexrulelabel] = $this->_date_time_string( $rexrulevalue );
        if(( 3 < count( $input[$rexrulelabel] )) && !isset( $input[$rexrulelabel]['tz'] ))
          $input[$rexrulelabel]['tz'] = 'Z';
      }
    }
    return $input;
  }
/**
 * convert format for input date to internal date with parameters
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.17 - 2008-10-31
 * @param mixed $year
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param array $params optional
 * @param string $caller optional
 * @return array
 */
  function _setDate( $year, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $tz=FALSE, $params=FALSE, $caller=null ) {
    $input = $parno = null;
    $localtime = (( 'dtstart' == $caller ) && in_array( $this->objName, array( 'vtimezone', 'standard', 'daylight' ))) ? TRUE : FALSE;
    if( $this->_isArrayDate( $year )) {
      if( $localtime ) unset ( $month['VALUE'], $month['TZID'] );
      $input['params'] = $this->_setParams( $month, array( 'VALUE' => 'DATE-TIME' ));
      if( isset( $input['params']['TZID'] )) {
        $input['params']['VALUE'] = 'DATE-TIME';
        unset( $year['tz'] );
      }
      $hitval          = (( !empty( $year['tz'] ) || !empty( $year[6] ))) ? 7 : 6;
      $parno           = $this->_existRem( $input['params'], 'VALUE', 'DATE-TIME', $hitval );
      $parno           = $this->_existRem( $input['params'], 'VALUE', 'DATE', 3, count( $year ), $parno );
      $input['value']  = $this->_date_time_array( $year, $parno );
    }
    elseif( $this->_isArrayTimestampDate( $year )) {
      if( $localtime ) unset ( $month['VALUE'], $month['TZID'] );
      $input['params'] = $this->_setParams( $month, array( 'VALUE' => 'DATE-TIME' ));
      if( isset( $input['params']['TZID'] )) {
        $input['params']['VALUE'] = 'DATE-TIME';
        unset( $year['tz'] );
      }
      $parno           = $this->_existRem( $input['params'], 'VALUE', 'DATE', 3 );
      $hitval          = ( isset( $year['tz'] )) ? 7 : 6;
      $parno           = $this->_existRem( $input['params'], 'VALUE', 'DATE-TIME', $hitval, $parno );
      $input['value']  = $this->_timestamp2date( $year, $parno );
    }
    elseif( 8 <= strlen( trim( $year ))) { // ex. 2006-08-03 10:12:18
      if( $localtime ) unset ( $month['VALUE'], $month['TZID'] );
      $input['params'] = $this->_setParams( $month, array( 'VALUE' => 'DATE-TIME' ));
      if( isset( $input['params']['TZID'] )) {
        $input['params']['VALUE'] = 'DATE-TIME';
        $parno = 6;
      }
      $parno           = $this->_existRem( $input['params'], 'VALUE', 'DATE-TIME', 7, $parno );
      $parno           = $this->_existRem( $input['params'], 'VALUE', 'DATE', 3, $parno, $parno );
      $input['value']  = $this->_date_time_string( $year, $parno );
    }
    else {
      if( is_array( $params )) {
        if( $localtime ) unset ( $params['VALUE'], $params['TZID'] );
        $input['params'] = $this->_setParams( $params, array( 'VALUE' => 'DATE-TIME' ));
      }
      elseif( is_array( $tz )) {
        $input['params'] = $this->_setParams( $tz,     array( 'VALUE' => 'DATE-TIME' ));
        $tz = FALSE;
      }
      elseif( is_array( $hour )) {
        $input['params'] = $this->_setParams( $hour,   array( 'VALUE' => 'DATE-TIME' ));
        $hour = $min = $sec = $tz = FALSE;
      }
      if( isset( $input['params']['TZID'] )) {
        $tz            = null;
        $input['params']['VALUE'] = 'DATE-TIME';
      }
      $parno           = $this->_existRem( $input['params'], 'VALUE', 'DATE', 3 );
      $hitval          = ( !empty( $tz )) ? 7 : 6;
      $parno           = $this->_existRem( $input['params'], 'VALUE', 'DATE-TIME', $hitval, $parno, $parno );
      $input['value']  = array( 'year'  => $year, 'month' => $month, 'day'   => $day );
      if( 3 != $parno ) {
        $input['value']['hour'] = ( $hour ) ? $hour : '0';
        $input['value']['min']  = ( $min )  ? $min  : '0';
        $input['value']['sec']  = ( $sec )  ? $sec  : '0';
        if( !empty( $tz ))
          $input['value']['tz'] = $tz;
      }
    }
    if( 3 == $parno ) {
      $input['params']['VALUE'] = 'DATE';
      unset( $input['value']['tz'] );
      unset( $input['params']['TZID'] );
    }
    elseif( isset( $input['params']['TZID'] ))
      unset( $input['value']['tz'] );
    if( $localtime ) unset( $input['value']['tz'], $input['params']['TZID'] );
    if( isset( $input['value']['tz'] ))
      $input['value']['tz'] = (string) $input['value']['tz'];
    if( !empty( $input['value']['tz'] ) && ( 'Z' != $input['value']['tz'] ) &&
      ( !$this->_isOffset( $input['value']['tz'] )))
      $input['params']['TZID'] = $input['value']['tz'];
    return $input;
  }
/**
 * convert format for input date (UTC) to internal date with parameters
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.17 - 2008-10-31
 * @param mixed $year
 * @param mixed $month optional
 * @param int $day optional
 * @param int $hour optional
 * @param int $min optional
 * @param int $sec optional
 * @param array $params optional
 * @return array
 */
  function _setDate2( $year, $month=FALSE, $day=FALSE, $hour=FALSE, $min=FALSE, $sec=FALSE, $params=FALSE ) {
    $input = null;
    if( $this->_isArrayDate( $year )) {
      $input['value']  = $this->_date_time_array( $year, 7 );
      $input['params'] = $this->_setParams( $month, array( 'VALUE' => 'DATE-TIME' ) );
    }
    elseif( $this->_isArrayTimestampDate( $year )) {
      $input['value']  = $this->_timestamp2date( $year, 7 );
      $input['params'] = $this->_setParams( $month, array( 'VALUE' => 'DATE-TIME' ) );
    }
    elseif( 8 <= strlen( trim( $year ))) { // ex. 2006-08-03 10:12:18
      $input['value']  = $this->_date_time_string( $year, 7 );
      $input['params'] = $this->_setParams( $month, array( 'VALUE' => 'DATE-TIME' ) );
    }
    else {
      $input['value']  = array( 'year'  => $year
                              , 'month' => $month
                              , 'day'   => $day
                              , 'hour'  => $hour
                              , 'min'   => $min
                              , 'sec'   => $sec );
      $input['params'] = $this->_setParams( $params, array( 'VALUE' => 'DATE-TIME' ));
    }
    $parno = $this->_existRem( $input['params'], 'VALUE', 'DATE-TIME', 7 ); // remove default
    if( !isset( $input['value']['hour'] ))
      $input['value']['hour'] = 0;
    if( !isset( $input['value']['min'] ))
      $input['value']['min'] = 0;
    if( !isset( $input['value']['sec'] ))
      $input['value']['sec'] = 0;
    if( !isset( $input['value']['tz'] ) || !$this->_isOffset( $input['value']['tz'] ))
      $input['value']['tz'] = 'Z';
    return $input;
  }
/**
 * check index and set (an indexed) content in multiple value array
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-06
 * @param array $valArr
 * @param mixed $value
 * @param array $params
 * @param array $defaults
 * @param int $index
 * @return void
 */
  function _setMval( & $valArr, $value, $params=FALSE, $defaults=FALSE, $index=FALSE ) {
    if( !is_array( $valArr )) $valArr = array();
    if( $index )
      $index = $index - 1;
    elseif( 0 < count( $valArr )) {
      $index = end( array_keys( $valArr ));
      $index += 1;
    }
    else
      $index = 0;
    $valArr[$index] = array( 'value' => $value, 'params' => $this->_setParams( $params, $defaults ));
    ksort( $valArr );
  }
/**
 * set input (formatted) parameters- component property attributes
 *
 * default parameters can be set, if missing
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 1.x.x - 2007-05-01
 * @param array $params
 * @param array $defaults
 * @return array
 */
  function _setParams( $params, $defaults=FALSE ) {
    if( !is_array( $params))
      $params = array();
    $input = array();
    foreach( $params as $paramKey => $paramValue ) {
      if( is_array( $paramValue )) {
        foreach( $paramValue as $pkey => $pValue ) {
          if(( '"' == substr( $pValue, 0, 1 )) && ( '"' == substr( $pValue, -1 )))
            $paramValue[$pkey] = substr( $pValue, 1, ( strlen( $pValue ) - 2 ));
        }
      }
      elseif(( '"' == substr( $paramValue, 0, 1 )) && ( '"' == substr( $paramValue, -1 )))
        $paramValue = substr( $paramValue, 1, ( strlen( $paramValue ) - 2 ));
      if( 'VALUE' == strtoupper( $paramKey ))
        $input['VALUE']                 = strtoupper( $paramValue );
      else
        $input[strtoupper( $paramKey )] = $paramValue;
    }
    if( is_array( $defaults )) {
      foreach( $defaults as $paramKey => $paramValue ) {
        if( !isset( $input[$paramKey] ))
          $input[$paramKey] = $paramValue;
      }
    }
    return (0 < count( $input )) ? $input : null;
  }
/**
 * step date, return updated date, array and timpstamp
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-18
 * @param array $date, date to step
 * @param int $timestamp
 * @param array $step, default array( 'day' => 1 )
 * @return void
 */
  function _stepdate( &$date, &$timestamp, $step=array( 'day' => 1 )) {
    foreach( $step as $stepix => $stepvalue )
      $date[$stepix] += $stepvalue;
    $timestamp  = $this->_date2timestamp( $date );
    $date       = $this->_timestamp2date( $timestamp, 6 );
    foreach( $date as $k => $v ) {
      if( ctype_digit( $v ))
        $date[$k] = (int) $v;
    }
  }
/**
 * convert timestamp to date array
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-11-01
 * @param mixed $timestamp
 * @param int $parno
 * @return array
 */
  function _timestamp2date( $timestamp, $parno=6 ) {
    if( is_array( $timestamp )) {
      if(( 7 == $parno ) && !empty( $timestamp['tz'] ))
        $tz = $timestamp['tz'];
      $timestamp = $timestamp['timestamp'];
    }
    $output = array( 'year'  => date( 'Y', $timestamp )
                   , 'month' => date( 'm', $timestamp )
                   , 'day'   => date( 'd', $timestamp ));
    if( 3 != $parno ) {
             $output['hour'] =  date( 'H', $timestamp );
             $output['min']  =  date( 'i', $timestamp );
             $output['sec']  =  date( 's', $timestamp );
      if( isset( $tz ))
        $output['tz'] = $tz;
    }
    return $output;
  }
/**
 * convert (numeric) local time offset to seconds correcting localtime to GMT
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.16 - 2008-10-19
 * @param string $offset
 * @return integer
 */
  function _tz2offset( $tz ) {
    $tz           = trim( (string) $tz );
    $offset       = 0;
    if(((     5  != strlen( $tz )) && ( 7  != strlen( $tz ))) ||
       ((    '+' != substr( $tz, 0, 1 )) && ( '-' != substr( $tz, 0, 1 ))) ||
       (( '0000' >= substr( $tz, 1, 4 )) && ( '9999' < substr( $tz, 1, 4 ))) ||
           (( 7  == strlen( $tz )) && ( '00' > substr( $tz, 5, 2 )) && ( '99' < substr( $tz, 5, 2 ))))
      return $offset;
    $hours2sec    = (int) substr( $tz, 1, 2 ) * 3600;
    $min2sec      = (int) substr( $tz, 3, 2 ) *   60;
    $sec          = ( 7  == strlen( $tz )) ? (int) substr( $tz, -2 ) : '00';
    $offset       = $hours2sec + $min2sec + $sec;
    $offset       = ('-' == substr( $tz, 0, 1 )) ? $offset : -1 * $offset;
    return $offset;
  }
/*********************************************************************************/
/*********************************************************************************/
/**
 * get general component config variables or info about subcomponents
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-02
 * @param string $config
 * @return value
 */
  function getConfig( $config ) {
    switch( strtoupper( $config )) {
      case 'ALLOWEMPTY':
        return $this->allowEmpty;
        break;
      case 'COMPSINFO':
        unset( $this->compix );
        $info = array();
        if( isset( $this->components )) {
          foreach( $this->components as $cix => $component ) {
            if( empty( $component )) continue;
            unset( $component->propix );
            $info[$cix]['ordno'] = $cix + 1;
            $info[$cix]['type']  = $component->objName;
            $info[$cix]['uid']   = $component->getProperty( 'uid' );
            $info[$cix]['props'] = $component->getConfig( 'propinfo' );
            $info[$cix]['sub']   = $component->getConfig( 'compsinfo' );
            unset( $component->propix );
          }
        }
        return $info;
        break;
      case 'FORMAT':
        return $this->format;
        break;
      case 'LANGUAGE':
         // get language for calendar component as defined in [RFC 1766]
        return $this->language;
        break;
      case 'NL':
      case 'NEWLINECHAR':
        return $this->nl;
        break;
      case 'PROPINFO':
        $output = array();
        if( !in_array( $this->objName, array( 'valarm', 'vtimezone', 'standard', 'daylight' ))) {
          if( empty( $this->uid['value'] )) $this->_makeuid();
                                              $output['UID']              = 1;
        }
        if( !empty( $this->dtstamp ))         $output['DTSTAMP']          = 1;
        if( !empty( $this->summary ))         $output['SUMMARY']          = 1;
        if( !empty( $this->description ))     $output['DESCRIPTION']      = count( $this->description );
        if( !empty( $this->dtstart ))         $output['DTSTART']          = 1;
        if( !empty( $this->dtend ))           $output['DTEND']            = 1;
        if( !empty( $this->due ))             $output['DUE']              = 1;
        if( !empty( $this->duration ))        $output['DURATION']         = 1;
        if( !empty( $this->rrule ))           $output['RRULE']            = count( $this->rrule );
        if( !empty( $this->rdate ))           $output['RDATE']            = count( $this->rdate );
        if( !empty( $this->exdate ))          $output['EXDATE']           = count( $this->exdate );
        if( !empty( $this->exrule ))          $output['EXRULE']           = count( $this->exrule );
        if( !empty( $this->action ))          $output['ACTION']           = 1;
        if( !empty( $this->attach ))          $output['ATTACH']           = count( $this->attach );
        if( !empty( $this->attendee ))        $output['ATTENDEE']         = count( $this->attendee );
        if( !empty( $this->categories ))      $output['CATEGORIES']       = count( $this->categories );
        if( !empty( $this->class ))           $output['CLASS']            = 1;
        if( !empty( $this->comment ))         $output['COMMENT']          = count( $this->comment );
        if( !empty( $this->completed ))       $output['COMPLETED']        = 1;
        if( !empty( $this->contact ))         $output['CONTACT']          = count( $this->contact );
        if( !empty( $this->created ))         $output['CREATED']          = 1;
        if( !empty( $this->freebusy ))        $output['FREEBUSY']         = count( $this->freebusy );
        if( !empty( $this->geo ))             $output['GEO']              = 1;
        if( !empty( $this->lastmodified ))    $output['LAST-MODIFIED']    = 1;
        if( !empty( $this->location ))        $output['LOCATION']         = 1;
        if( !empty( $this->organizer ))       $output['ORGANIZER']        = 1;
        if( !empty( $this->percentcomplete )) $output['PERCENT-COMPLETE'] = 1;
        if( !empty( $this->priority ))        $output['PRIORITY']         = 1;
        if( !empty( $this->recurrenceid ))    $output['RECURRENCE-ID']    = 1;
        if( !empty( $this->relatedto ))       $output['RELATED-TO']       = count( $this->relatedto );
        if( !empty( $this->repeat ))          $output['REPEAT']           = 1;
        if( !empty( $this->requeststatus ))   $output['REQUEST-STATUS']   = count( $this->requeststatus );
        if( !empty( $this->resources ))       $output['RESOURCES']        = count( $this->resources );
        if( !empty( $this->sequence ))        $output['SEQUENCE']         = 1;
        if( !empty( $this->status ))          $output['STATUS']           = 1;
        if( !empty( $this->transp ))          $output['TRANSP']           = 1;
        if( !empty( $this->trigger ))         $output['TRIGGER']          = 1;
        if( !empty( $this->tzid ))            $output['TZID']             = 1;
        if( !empty( $this->tzname ))          $output['TZNAME']           = count( $this->tzname );
        if( !empty( $this->tzoffsetfrom ))    $output['TZOFFSETTFROM']    = 1;
        if( !empty( $this->tzoffsetto ))      $output['TZOFFSETTO']       = 1;
        if( !empty( $this->tzurl ))           $output['TZURL']            = 1;
        if( !empty( $this->url ))             $output['URL']              = 1;
        if( !empty( $this->xprop ))           $output['X-PROP']           = count( $this->xprop );
        return $output;
        break;
      case 'UNIQUE_ID':
        if( empty( $this->unique_id ))
          $this->unique_id  = ( isset( $_SERVER['SERVER_NAME'] )) ? gethostbyname( $_SERVER['SERVER_NAME'] ) : 'localhost';
        return $this->unique_id;
        break;
    }
  }
/**
 * general component config setting
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-24
 * @param string $config
 * @param string $value
 * @return void
 */
  function setConfig( $config, $value ) {
    $res = FALSE;
    switch( strtoupper( $config )) {
      case 'ALLOWEMPTY':
        $this->allowEmpty = $value;
        $subcfg = array( 'ALLOWEMPTY' => $value );
        $res    = TRUE;
        break;
      case 'FORMAT':
        $value  = trim( $value );
        $this->format = $value;
        $this->_createFormat();
        $subcfg = array( 'FORMAT' => $value );
        $res    = TRUE;
        break;
      case 'LANGUAGE':
         // set language for calendar component as defined in [RFC 1766]
        $value  = trim( $value );
        $this->language = $value;
        $subcfg = array( 'LANGUAGE' => $value );
        $res    = TRUE;
        break;
      case 'NL':
      case 'NEWLINECHAR':
        $this->nl = $value;
        $subcfg = array( 'NL' => $value );
        $res    = TRUE;
        break;
      case 'UNIQUE_ID':
        $value  = trim( $value );
        $this->unique_id = $value;
        $subcfg = array( 'UNIQUE_ID' => $value );
        $res    = TRUE;
        break;
    }
    if( !$res ) return FALSE;
    if( isset( $subcfg ) && !empty( $this->components )) {
      foreach( $subcfg as $cfgkey => $cfgvalue ) {
        foreach( $this->components as $cix => $component ) {
          $res = $component->setConfig( $cfgkey, $cfgvalue );
          if( !$res )
            break 2;
          $this->components[$cix] = $component; // PHP4 compliant
        }
      }
    }
    return $res;
  }
/*********************************************************************************/
/**
 * delete component property value
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-14
 * @param string $propName
 * @param int @propix, optional, if specific property is wanted in case of multiply occurences
 * @return bool, if successfull delete TRUE
 */
  function deleteProperty( $propName, $propix=FALSE ) {
    if( $this->_notExistProp( $propName )) return FALSE;
    $propName = strtoupper( $propName );
    if( in_array( $propName, array( 'ATTACH',   'ATTENDEE', 'CATEGORIES', 'COMMENT',   'CONTACT', 'DESCRIPTION',    'EXDATE', 'EXRULE',
                                    'FREEBUSY', 'RDATE',    'RELATED-TO', 'RESOURCES', 'RRULE',   'REQUEST-STATUS', 'TZNAME', 'X-PROP'  ))) {
      if( !$propix )
        $propix = ( isset( $this->propdelix[$propName] )) ? $this->propdelix[$propName] + 2 : 1;
      $this->propdelix[$propName] = --$propix;
    }
    $return = FALSE;
    switch( $propName ) {
      case 'ACTION':
        if( !empty( $this->action )) {
          $this->action = '';
          $return = TRUE;
        }
        break;
      case 'ATTACH':
        return $this->deletePropertyM( $this->attach, $propix );
        break;
      case 'ATTENDEE':
        return $this->deletePropertyM( $this->attendee, $propix );
        break;
      case 'CATEGORIES':
        return $this->deletePropertyM( $this->categories, $propix );
        break;
      case 'CLASS':
        if( !empty( $this->class )) {
          $this->class = '';
          $return = TRUE;
        }
        break;
      case 'COMMENT':
        return $this->deletePropertyM( $this->comment, $propix );
        break;
      case 'COMPLETED':
        if( !empty( $this->completed )) {
          $this->completed = '';
          $return = TRUE;
        }
        break;
      case 'CONTACT':
        return $this->deletePropertyM( $this->contact, $propix );
        break;
      case 'CREATED':
        if( !empty( $this->created )) {
          $this->created = '';
          $return = TRUE;
        }
        break;
      case 'DESCRIPTION':
        return $this->deletePropertyM( $this->description, $propix );
        break;
      case 'DTEND':
        if( !empty( $this->dtend )) {
          $this->dtend = '';
          $return = TRUE;
        }
        break;
      case 'DTSTAMP':
        if( in_array( $this->objName, array( 'valarm', 'vtimezone', 'standard', 'daylight' )))
          return FALSE;
        if( !empty( $this->dtstamp )) {
          $this->dtstamp = '';
          $return = TRUE;
        }
        break;
      case 'DTSTART':
        if( !empty( $this->dtstart )) {
          $this->dtstart = '';
          $return = TRUE;
        }
        break;
      case 'DUE':
        if( !empty( $this->due )) {
          $this->due = '';
          $return = TRUE;
        }
        break;
      case 'DURATION':
        if( !empty( $this->duration )) {
          $this->duration = '';
          $return = TRUE;
        }
        break;
      case 'EXDATE':
        return $this->deletePropertyM( $this->exdate, $propix );
        break;
      case 'EXRULE':
        return $this->deletePropertyM( $this->exrule, $propix );
        break;
      case 'FREEBUSY':
        return $this->deletePropertyM( $this->freebusy, $propix );
        break;
      case 'GEO':
        if( !empty( $this->geo )) {
          $this->geo = '';
          $return = TRUE;
        }
        break;
      case 'LAST-MODIFIED':
        if( !empty( $this->lastmodified )) {
          $this->lastmodified = '';
          $return = TRUE;
        }
        break;
      case 'LOCATION':
        if( !empty( $this->location )) {
          $this->location = '';
          $return = TRUE;
        }
        break;
      case 'ORGANIZER':
        if( !empty( $this->organizer )) {
          $this->organizer = '';
          $return = TRUE;
        }
        break;
      case 'PERCENT-COMPLETE':
        if( !empty( $this->percentcomplete )) {
          $this->percentcomplete = '';
          $return = TRUE;
        }
        break;
      case 'PRIORITY':
        if( !empty( $this->priority )) {
          $this->priority = '';
          $return = TRUE;
        }
        break;
      case 'RDATE':
        return $this->deletePropertyM( $this->rdate, $propix );
        break;
      case 'RECURRENCE-ID':
        if( !empty( $this->recurrenceid )) {
          $this->recurrenceid = '';
          $return = TRUE;
        }
        break;
      case 'RELATED-TO':
        return $this->deletePropertyM( $this->relatedto, $propix );
        break;
      case 'REPEAT':
        if( !empty( $this->repeat )) {
          $this->repeat = '';
          $return = TRUE;
        }
        break;
      case 'REQUEST-STATUS':
        return $this->deletePropertyM( $this->requeststatus, $propix );
        break;
      case 'RESOURCES':
        return $this->deletePropertyM( $this->resources, $propix );
        break;
      case 'RRULE':
        return $this->deletePropertyM( $this->rrule, $propix );
        break;
      case 'SEQUENCE':
        if( !empty( $this->sequence )) {
          $this->sequence = '';
          $return = TRUE;
        }
        break;
      case 'STATUS':
        if( !empty( $this->status )) {
          $this->status = '';
          $return = TRUE;
        }
        break;
      case 'SUMMARY':
        if( !empty( $this->summary )) {
          $this->summary = '';
          $return = TRUE;
        }
        break;
      case 'TRANSP':
        if( !empty( $this->transp )) {
          $this->transp = '';
          $return = TRUE;
        }
        break;
      case 'TRIGGER':
        if( !empty( $this->trigger )) {
          $this->trigger = '';
          $return = TRUE;
        }
        break;
      case 'TZID':
        if( !empty( $this->tzid )) {
          $this->tzid = '';
          $return = TRUE;
        }
        break;
      case 'TZNAME':
        return $this->deletePropertyM( $this->tzname, $propix );
        break;
      case 'TZOFFSETFROM':
        if( !empty( $this->tzoffsetfrom )) {
          $this->tzoffsetfrom = '';
          $return = TRUE;
        }
        break;
      case 'TZOFFSETTO':
        if( !empty( $this->tzoffsetto )) {
          $this->tzoffsetto = '';
          $return = TRUE;
        }
        break;
      case 'TZURL':
        if( !empty( $this->tzurl )) {
          $this->tzurl = '';
          $return = TRUE;
        }
        break;
      case 'UID':
        if( in_array( $this->objName, array( 'valarm', 'vtimezone', 'standard', 'daylight' )))
          return FALSE;
        if( !empty( $this->uid )) {
          $this->uid = '';
          $return = TRUE;
        }
        break;
      case 'URL':
        if( !empty( $this->url )) {
          $this->url = '';
          $return = TRUE;
        }
        break;
      default:
        $reduced = '';
        if( $propName != 'X-PROP' ) {
          if( !isset( $this->xprop[$propName] )) return FALSE;
          foreach( $this->xprop as $k => $a ) {
            if(( $k != $propName ) && !empty( $a ))
              $reduced[$k] = $a;
          }
        }
        else {
          if( count( $this->xprop ) <= $propix )  return FALSE;
          $xpropno = 0;
          foreach( $this->xprop as $xpropkey => $xpropvalue ) {
            if( $propix != $xpropno )
              $reduced[$xpropkey] = $xpropvalue;
            $xpropno++;
          }
        }
        $this->xprop = $reduced;
        return TRUE;
    }
    return $return;
  }
/*********************************************************************************/
/**
 * delete component property value, fixing components with multiple occurencies
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.5 - 2008-11-07
 * @param array $multiprop, reference to a component property
 * @param int @propix, default 0
 * @return bool TRUE
 */
  function deletePropertyM( & $multiprop, $propix=0 ) {
    if( !isset( $multiprop[$propix])) return FALSE;
    unset( $multiprop[$propix] );
    if( empty( $multiprop )) $multiprop = '';
    return ( isset( $this->multiprop[$propix] )) ? FALSE : TRUE;
  }
/**
 * get component property value/params
 *
 * if property has multiply values, consequtive function calls are needed
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-02
 * @param string $propName, optional
 * @param int @propix, optional, if specific property is wanted in case of multiply occurences
 * @param bool $inclParam=FALSE
 * @param bool $specform=FALSE
 * @return mixed
 */
  function getProperty( $propName=FALSE, $propix=FALSE, $inclParam=FALSE, $specform=FALSE ) {
    if( $this->_notExistProp( $propName )) return FALSE;
    $propName = ( $propName ) ? strtoupper( $propName ) : 'X-PROP';
    if( in_array( $propName, array( 'ATTACH',   'ATTENDEE', 'CATEGORIES', 'COMMENT',   'CONTACT', 'DESCRIPTION',    'EXDATE', 'EXRULE',
                                    'FREEBUSY', 'RDATE',    'RELATED-TO', 'RESOURCES', 'RRULE',   'REQUEST-STATUS', 'TZNAME', 'X-PROP'  ))) {
      if( !$propix )
        $propix = ( isset( $this->propix[$propName] )) ? $this->propix[$propName] + 2 : 1;
      $this->propix[$propName] = --$propix;
    }
    switch( $propName ) {
      case 'ACTION':
        if( !empty( $this->action['value'] )) return ( $inclParam ) ? $this->action : $this->action['value'];
        break;
      case 'ATTACH':
        if( !isset( $this->attach[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->attach[$propix] : $this->attach[$propix]['value'];
        break;
      case 'ATTENDEE':
        if( !isset( $this->attendee[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->attendee[$propix] : $this->attendee[$propix]['value'];
        break;
      case 'CATEGORIES':
        if( !isset( $this->categories[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->categories[$propix] : $this->categories[$propix]['value'];
        break;
      case 'CLASS':
        if( !empty( $this->class['value'] )) return ( $inclParam ) ? $this->class : $this->class['value'];
        break;
      case 'COMMENT':
        if( !isset( $this->comment[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->comment[$propix] : $this->comment[$propix]['value'];
        break;
      case 'COMPLETED':
        if( !empty( $this->completed['value'] )) return ( $inclParam ) ? $this->completed : $this->completed['value'];
        break;
      case 'CONTACT':
        if( !isset( $this->contact[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->contact[$propix] : $this->contact[$propix]['value'];
        break;
      case 'CREATED':
        if( !empty( $this->created['value'] )) return ( $inclParam ) ? $this->created : $this->created['value'];
        break;
      case 'DESCRIPTION':
        if( !isset( $this->description[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->description[$propix] : $this->description[$propix]['value'];
        break;
      case 'DTEND':
        if( !empty( $this->dtend['value'] )) return ( $inclParam ) ? $this->dtend : $this->dtend['value'];
        break;
      case 'DTSTAMP':
        if( in_array( $this->objName, array( 'valarm', 'vtimezone', 'standard', 'daylight' )))
          return;
        if( !isset( $this->dtstamp['value'] ))
          $this->_makeDtstamp();
        return ( $inclParam ) ? $this->dtstamp : $this->dtstamp['value'];
        break;
      case 'DTSTART':
        if( !empty( $this->dtstart['value'] )) return ( $inclParam ) ? $this->dtstart : $this->dtstart['value'];
        break;
      case 'DUE':
        if( !empty( $this->due['value'] )) return ( $inclParam ) ? $this->due : $this->due['value'];
        break;
      case 'DURATION':
        if( !isset( $this->duration['value'] )) return FALSE;
        $value = ( $specform ) ? $this->duration2date() : $this->duration['value'];
        return ( $inclParam ) ? array( 'value' => $value, 'params' =>  $this->duration['params'] ) : $value;
        break;
      case 'EXDATE':
        if( !isset( $this->exdate[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->exdate[$propix] : $this->exdate[$propix]['value'];
        break;
      case 'EXRULE':
        if( !isset( $this->exrule[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->exrule[$propix] : $this->exrule[$propix]['value'];
        break;
      case 'FREEBUSY':
        if( !isset( $this->freebusy[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->freebusy[$propix] : $this->freebusy[$propix]['value'];
        break;
      case 'GEO':
        if( !empty( $this->geo['value'] )) return ( $inclParam ) ? $this->geo : $this->geo['value'];
        break;
      case 'LAST-MODIFIED':
        if( !empty( $this->lastmodified['value'] )) return ( $inclParam ) ? $this->lastmodified : $this->lastmodified['value'];
        break;
      case 'LOCATION':
        if( !empty( $this->location['value'] )) return ( $inclParam ) ? $this->location : $this->location['value'];
        break;
      case 'ORGANIZER':
        if( !empty( $this->organizer['value'] )) return ( $inclParam ) ? $this->organizer : $this->organizer['value'];
        break;
      case 'PERCENT-COMPLETE':
        if( !empty( $this->percentcomplete['value'] )) return ( $inclParam ) ? $this->percentcomplete : $this->percentcomplete['value'];
        break;
      case 'PRIORITY':
        if( !empty( $this->priority['value'] )) return ( $inclParam ) ? $this->priority : $this->priority['value'];
        break;
      case 'RDATE':
        if( !isset( $this->rdate[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->rdate[$propix] : $this->rdate[$propix]['value'];
        break;
      case 'RECURRENCE-ID':
        if( !empty( $this->recurrenceid['value'] )) return ( $inclParam ) ? $this->recurrenceid : $this->recurrenceid['value'];
        break;
      case 'RELATED-TO':
        if( !isset( $this->relatedto[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->relatedto[$propix] : $this->relatedto[$propix]['value'];
        break;
      case 'REPEAT':
        if( !empty( $this->repeat['value'] )) return ( $inclParam ) ? $this->repeat : $this->repeat['value'];
        break;
      case 'REQUEST-STATUS':
        if( !isset( $this->requeststatus[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->requeststatus[$propix] : $this->requeststatus[$propix]['value'];
        break;
      case 'RESOURCES':
        if( !isset( $this->resources[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->resources[$propix] : $this->resources[$propix]['value'];
        break;
      case 'RRULE':
        if( !isset( $this->rrule[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->rrule[$propix] : $this->rrule[$propix]['value'];
        break;
      case 'SEQUENCE':
        if( !empty( $this->sequence['value'] )) return ( $inclParam ) ? $this->sequence : $this->sequence['value'];
        break;
      case 'STATUS':
        if( !empty( $this->status['value'] )) return ( $inclParam ) ? $this->status : $this->status['value'];
        break;
      case 'SUMMARY':
        if( !empty( $this->summary['value'] )) return ( $inclParam ) ? $this->summary : $this->summary['value'];
        break;
      case 'TRANSP':
        if( !empty( $this->transp['value'] )) return ( $inclParam ) ? $this->transp : $this->transp['value'];
        break;
      case 'TRIGGER':
        if( !empty( $this->trigger['value'] )) return ( $inclParam ) ? $this->trigger : $this->trigger['value'];
        break;
      case 'TZID':
        if( !empty( $this->tzid['value'] )) return ( $inclParam ) ? $this->tzid : $this->tzid['value'];
        break;
      case 'TZNAME':
        if( !isset( $this->tzname[$propix] )) return FALSE;
        return ( $inclParam ) ? $this->tzname[$propix] : $this->tzname[$propix]['value'];
        break;
      case 'TZOFFSETFROM':
        if( !empty( $this->tzoffsetfrom['value'] )) return ( $inclParam ) ? $this->tzoffsetfrom : $this->tzoffsetfrom['value'];
        break;
      case 'TZOFFSETTO':
        if( !empty( $this->tzoffsetto['value'] )) return ( $inclParam ) ? $this->tzoffsetto : $this->tzoffsetto['value'];
        break;
      case 'TZURL':
        if( !empty( $this->tzurl['value'] )) return ( $inclParam ) ? $this->tzurl : $this->tzurl['value'];
        break;
      case 'UID':
        if( in_array( $this->objName, array( 'valarm', 'vtimezone', 'standard', 'daylight' )))
          return FALSE;
        if( empty( $this->uid['value'] ))
          $this->_makeuid();
        return ( $inclParam ) ? $this->uid : $this->uid['value'];
        break;
      case 'URL':
        if( !empty( $this->url['value'] )) return ( $inclParam ) ? $this->url : $this->url['value'];
        break;
      default:
        if( $propName != 'X-PROP' ) {
          if( !isset( $this->xprop[$propName] )) return FALSE;
          return ( $inclParam ) ? array( $propName, $this->xprop[$propName] )
                                : array( $propName, $this->xprop[$propName]['value'] );
        }
        else {
          if( empty( $this->xprop )) return FALSE;
          $xpropno = 0;
          foreach( $this->xprop as $xpropkey => $xpropvalue ) {
            if( $propix == $xpropno )
              return ( $inclParam ) ? array( $xpropkey, $this->xprop[$xpropkey] )
                                    : array( $xpropkey, $this->xprop[$xpropkey]['value'] );
            else
              $xpropno++;
          }
          return FALSE; // not found ??
        }
    }
    return FALSE;
  }
/**
 * general component property setting
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-05
 * @param mixed $args variable number of function arguments,
 *                    first argument is ALWAYS component name,
 *                    second ALWAYS component value!
 * @return void
 */
  function setProperty() {
    $numargs    = func_num_args();
    if( 1 > $numargs ) return FALSE;
    $arglist    = func_get_args();
    if( $this->_notExistProp( $arglist[0] )) return FALSE;
    if( !$this->getConfig( 'allowEmpty' ) && ( !isset( $arglist[1] ) || empty( $arglist[1] )))
      return FALSE;
    $arglist[0] = strtoupper( $arglist[0] );
    for( $argix=$numargs; $argix < 12; $argix++ ) {
      if( !isset( $arglist[$argix] ))
        $arglist[$argix] = null;
    }
    switch( $arglist[0] ) {
      case 'ACTION':
        return $this->setAction( $arglist[1], $arglist[2] );
      case 'ATTACH':
        return $this->setAttach( $arglist[1], $arglist[2], $arglist[3] );
      case 'ATTENDEE':
        return $this->setAttendee( $arglist[1], $arglist[2], $arglist[3] );
      case 'CATEGORIES':
        return $this->setCategories( $arglist[1], $arglist[2], $arglist[3] );
      case 'CLASS':
        return $this->setClass( $arglist[1], $arglist[2] );
      case 'COMMENT':
        return $this->setComment( $arglist[1], $arglist[2], $arglist[3] );
      case 'COMPLETED':
        return $this->setCompleted( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6], $arglist[7] );
      case 'CONTACT':
        return $this->setContact( $arglist[1], $arglist[2], $arglist[3] );
      case 'CREATED':
        return $this->setCreated( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6], $arglist[7] );
      case 'DESCRIPTION':
        return $this->setDescription( $arglist[1], $arglist[2], $arglist[3] );
      case 'DTEND':
        return $this->setDtend( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6], $arglist[7], $arglist[8] );
      case 'DTSTAMP':
        return $this->setDtstamp( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6], $arglist[7] );
      case 'DTSTART':
        return $this->setDtstart( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6], $arglist[7], $arglist[8] );
      case 'DUE':
        return $this->setDue( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6], $arglist[7], $arglist[8] );
      case 'DURATION':
        return $this->setDuration( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6] );
      case 'EXDATE':
        return $this->setExdate( $arglist[1], $arglist[2], $arglist[3] );
      case 'EXRULE':
        return $this->setExrule( $arglist[1], $arglist[2], $arglist[3] );
      case 'FREEBUSY':
        return $this->setFreebusy( $arglist[1], $arglist[2], $arglist[3], $arglist[4] );
      case 'GEO':
        return $this->setGeo( $arglist[1], $arglist[2], $arglist[3] );
      case 'LAST-MODIFIED':
        return $this->setLastModified( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6], $arglist[7] );
      case 'LOCATION':
        return $this->setLocation( $arglist[1], $arglist[2] );
      case 'ORGANIZER':
        return $this->setOrganizer( $arglist[1], $arglist[2] );
      case 'PERCENT-COMPLETE':
        return $this->setPercentComplete( $arglist[1], $arglist[2] );
      case 'PRIORITY':
        return $this->setPriority( $arglist[1], $arglist[2] );
      case 'RDATE':
        return $this->setRdate( $arglist[1], $arglist[2], $arglist[3] );
      case 'RECURRENCE-ID':
       return $this->setRecurrenceid( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6], $arglist[7], $arglist[8] );
      case 'RELATED-TO':
        return $this->setRelatedTo( $arglist[1], $arglist[2], $arglist[3] );
      case 'REPEAT':
        return $this->setRepeat( $arglist[1], $arglist[2] );
      case 'REQUEST-STATUS':
        return $this->setRequestStatus( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5] );
      case 'RESOURCES':
        return $this->setResources( $arglist[1], $arglist[2], $arglist[3] );
      case 'RRULE':
        return $this->setRrule( $arglist[1], $arglist[2], $arglist[3] );
      case 'SEQUENCE':
        return $this->setSequence( $arglist[1], $arglist[2] );
      case 'STATUS':
        return $this->setStatus( $arglist[1], $arglist[2] );
      case 'SUMMARY':
        return $this->setSummary( $arglist[1], $arglist[2] );
      case 'TRANSP':
        return $this->setTransp( $arglist[1], $arglist[2] );
      case 'TRIGGER':
        return $this->setTrigger( $arglist[1], $arglist[2], $arglist[3], $arglist[4], $arglist[5], $arglist[6], $arglist[7], $arglist[8], $arglist[9], $arglist[10], $arglist[11] );
      case 'TZID':
        return $this->setTzid( $arglist[1], $arglist[2] );
      case 'TZNAME':
        return $this->setTzname( $arglist[1], $arglist[2], $arglist[3] );
      case 'TZOFFSETFROM':
        return $this->setTzoffsetfrom( $arglist[1], $arglist[2] );
      case 'TZOFFSETTO':
        return $this->setTzoffsetto( $arglist[1], $arglist[2] );
      case 'TZURL':
        return $this->setTzurl( $arglist[1], $arglist[2] );
      case 'UID':
        return $this->setUid( $arglist[1], $arglist[2] );
      case 'URL':
        return $this->setUrl( $arglist[1], $arglist[2] );
      default:
        return $this->setXprop( $arglist[0], $arglist[1], $arglist[2] );
    }
    return FALSE;
  }
/*********************************************************************************/
/**
 * parse component unparsed data into properties
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.2 - 2008-10-23
 * @param mixed $unparsedtext, optional, strict rfc2445 formatted, single property string or array of property strings
 * @return bool FALSE if error occurs during parsing
 *
 */
  function parse( $unparsedtext=null ) {
    if( $unparsedtext ) {
      $this->unparsed = array();
      if( is_array( $unparsedtext )) {
        $comp = & $this;
        foreach ( $unparsedtext as $line ) {
          if( 'END:VALARM' == strtoupper( substr( $line, 0, 10 ))) {
            $this->setComponent( $comp );
            $comp =  & $this;
            continue;
          }
          elseif( 'BEGIN:VALARM' == strtoupper( substr( $line, 0, 12 ))) {
            $comp = new valarm();
            continue;
          }
          else
            $comp->unparsed[] = $line;
        }
      }
      else
        $this->unparsed = array( trim( $unparsedtext ));
    }
    elseif( !isset( $this->unparsed ))
      $this->unparsed = array();
            /* concatenate property values spread over several lines */
    $lastix    = -1;
    $propnames = array( 'action', 'attach', 'attendee', 'categories', 'comment', 'completed'
                      , 'contact', 'class', 'created', 'description', 'dtend', 'dtstart'
                      , 'dtstamp', 'due', 'duration', 'exdate', 'exrule', 'freebusy', 'geo'
                      , 'last-modified', 'location', 'organizer', 'percent-complete'
                      , 'priority', 'rdate', 'recurrence-id', 'related-to', 'repeat'
                      , 'request-status', 'resources', 'rrule', 'sequence', 'status'
                      , 'summary', 'transp', 'trigger', 'tzid', 'tzname', 'tzoffsetfrom'
                      , 'tzoffsetto', 'tzurl', 'uid', 'url', 'x-' );
    $proprows  = array();
    foreach( $this->unparsed as $line ) {
      $newProp = FALSE;
      foreach ( $propnames as $propname ) {
        if( $propname == strtolower( substr( $line, 0, strlen( $propname )))) {
          $newProp = TRUE;
          break;
        }
      }
      if( $newProp ) {
        $newProp = FALSE;
        $lastix++;
        $proprows[$lastix]  = $line;
      }
      else {
            /* remove line breaks */
        if(( '\n' == substr( $proprows[$lastix], -2 )) &&
           (  ' ' == substr( $line, 0, 1 ))) {
          $proprows[$lastix] = substr( $proprows[$lastix], 0, strlen( $proprows[$lastix] ) - 2 );
          $line = substr( $line, 1 );
        }
        $proprows[$lastix] .= $line;
      }
    }
            /* parse each property 'line' */
    foreach( $proprows as $line ) {
      $line = str_replace( "\n ", '', $line );
      if( '\n' == substr( $line, -2 ))
        $line = substr( $line, 0, strlen( $line ) - 2 );
            /* get propname, (problem with x-properties, otherwise in previous loop) */
      $cix = $propname = null;
      for( $cix=0; $cix < strlen( $line ); $cix++ ) {
        if( in_array( $line{$cix}, array( ':', ';' )))
          break;
        else {
          $propname .= $line{$cix};
        }
      }
      if(( 'x-' == substr( $propname, 0, 2 )) || ( 'X-' == substr( $propname, 0, 2 ))) {
        $propname2 = $propname;
        $propname  = 'X-';
      }
            /* rest of the line is opt.params and value */
      $line = substr( $line, $cix );
            /* separate attributes from value */
      $attr   = array();
      $attrix = -1;
      $strlen = strlen( $line );
      for( $cix=0; $cix < $strlen; $cix++ ) {
        if((       ':'   == $line{$cix} )             &&
                 ( '://' != substr( $line, $cix, 3 )) &&
           ( 'mailto:'   != strtolower( substr( $line, $cix - 6, 7 )))) {
          $attrEnd = TRUE;
          if(( $cix < ( $strlen - 4 )) &&
               ctype_digit( substr( $line, $cix+1, 4 ))) { // an URI with a (4pos) portnr??
            for( $c2ix = $cix; 3 < $c2ix; $c2ix-- ) {
              if( '://' == substr( $line, $c2ix - 2, 3 )) {
                $attrEnd = FALSE;
                break; // an URI with a portnr!!
              }
            }
          }
          if( $attrEnd) {
            $line = substr( $line, $cix + 1 );
            break;
          }
        }
        if( ';' == $line{$cix} )
          $attr[++$attrix] = null;
        else
          $attr[$attrix] .= $line{$cix};
      }
            /* make attributes in array format */
      $propattr = array();
      foreach( $attr as $attribute ) {
        $attrsplit = explode( '=', $attribute, 2 );
        if( 1 < count( $attrsplit ))
          $propattr[$attrsplit[0]] = $attrsplit[1];
        else
          $propattr[] = $attribute;
      }
            /* call setProperty( $propname.. . */
      switch( $propname ) {
        case 'ATTENDEE':
          foreach( $propattr as $pix => $attr ) {
            $attr2 = explode( ',', $attr );
              if( 1 < count( $attr2 ))
                $propattr[$pix] = $attr2;
          }
          $this->setProperty( $propname, $line, $propattr );
          break;
        case 'CATEGORIES':
        case 'RESOURCES':
          if( FALSE !== strpos( $line, ',' )) {
            $content  = explode( ',', $line );
            $clen     = count( $content );
            for( $cix = 0; $cix < $clen; $cix++ ) {
              if( "\\" == substr($content[$cix], -1)) {
                $content[$cix] .= ','.$content[$cix + 1];
                unset($content[$cix + 1]);
                $cix++;
              }
            }
            if( 1 < count( $content )) {
              $content = array_values( $content );
              foreach( $content as $cix => $contentPart )
                $content[$cix] = $this->_strunrep( $contentPart );
              $this->setProperty( $propname, $content, $propattr );
              break;
            }
            else
              $line = reset( $content );
          }
        case 'X-':
          $propname = ( isset( $propname2 )) ? $propname2 : $propname;
        case 'COMMENT':
        case 'CONTACT':
        case 'DESCRIPTION':
        case 'LOCATION':
        case 'SUMMARY':
          if( empty( $line ))
            $propattr = null;
          $this->setProperty( $propname, $this->_strunrep( $line ), $propattr );
          unset( $propname2 );
          break;
        case 'REQUEST-STATUS':
          $values    = explode( ';', $line, 3 );
          $values[1] = ( !isset( $values[1] )) ? null : $this->_strunrep( $values[1] );
          $values[2] = ( !isset( $values[2] )) ? null : $this->_strunrep( $values[2] );
          $this->setProperty( $propname
                            , $values[0]  // statcode
                            , $values[1]  // statdesc
                            , $values[2]  // extdata
                            , $propattr );
          break;
        case 'FREEBUSY':
          $fbtype = ( isset( $propattr['FBTYPE'] )) ? $propattr['FBTYPE'] : ''; // force setting default, if missing
          unset( $propattr['FBTYPE'] );
          $values = explode( ',', $line );
          foreach( $values as $vix => $value ) {
            $value2 = explode( '/', $value );
            if( 1 < count( $value2 ))
              $values[$vix] = $value2;
          }
          $this->setProperty( $propname, $fbtype, $values, $propattr );
          break;
        case 'GEO':
          $value = explode( ';', $line, 2 );
          if( 2 > count( $value ))
            $value[1] = null;
          $this->setProperty( $propname, $value[0], $value[1], $propattr );
          break;
        case 'EXDATE':
          $values = ( !empty( $line )) ? explode( ',', $line ) : null;
          $this->setProperty( $propname, $values, $propattr );
          break;
        case 'RDATE':
          if( empty( $line )) {
            $this->setProperty( $propname, $line, $propattr );
            break;
          }
          $values = explode( ',', $line );
          foreach( $values as $vix => $value ) {
            $value2 = explode( '/', $value );
            if( 1 < count( $value2 ))
              $values[$vix] = $value2;
          }
          $this->setProperty( $propname, $values, $propattr );
          break;
        case 'EXRULE':
        case 'RRULE':
          $values = explode( ';', $line );
          $recur = array();
          foreach( $values as $value2 ) {
            if( empty( $value2 ))
              continue; // ;-char in ending position ???
            $value3 = explode( '=', $value2, 2 );
            $rulelabel = strtoupper( $value3[0] );
            switch( $rulelabel ) {
              case 'BYDAY': {
                $value4 = explode( ',', $value3[1] );
                if( 1 < count( $value4 )) {
                  foreach( $value4 as $v5ix => $value5 ) {
                    $value6 = array();
                    $dayno = $dayname = null;
                    $value5 = trim( (string) $value5 );
                    if(( ctype_alpha( substr( $value5, -1 ))) &&
                       ( ctype_alpha( substr( $value5, -2, 1 )))) {
                      $dayname = substr( $value5, -2, 2 );
                      if( 2 < strlen( $value5 ))
                        $dayno = substr( $value5, 0, ( strlen( $value5 ) - 2 ));
                    }
                    if( $dayno )
                      $value6[] = $dayno;
                    if( $dayname )
                      $value6['DAY'] = $dayname;
                    $value4[$v5ix] = $value6;
                  }
                }
                else {
                  $value4 = array();
                  $dayno  = $dayname = null;
                  $value5 = trim( (string) $value3[1] );
                  if(( ctype_alpha( substr( $value5, -1 ))) &&
                     ( ctype_alpha( substr( $value5, -2, 1 )))) {
                      $dayname = substr( $value5, -2, 2 );
                    if( 2 < strlen( $value5 ))
                      $dayno = substr( $value5, 0, ( strlen( $value5 ) - 2 ));
                  }
                  if( $dayno )
                    $value4[] = $dayno;
                  if( $dayname )
                    $value4['DAY'] = $dayname;
                }
                $recur[$rulelabel] = $value4;
                break;
              }
              default: {
                $value4 = explode( ',', $value3[1] );
                if( 1 < count( $value4 ))
                  $value3[1] = $value4;
                $recur[$rulelabel] = $value3[1];
                break;
              }
            } // end - switch $rulelabel
          } // end - foreach( $values.. .
          $this->setProperty( $propname, $recur, $propattr );
          break;
        default:
          $this->setProperty( $propname, $line, $propattr );
          break;
      } // end  switch( $propname.. .
    } // end - foreach( $proprows.. .
    unset( $this->unparsed, $proprows );
    if( isset( $this->components ) && is_array( $this->components ) && ( 0 < count( $this->components ))) {
      for( $six = 0; $six < count( $this->components ); $six++ ) {
        if( !empty( $this->components[$six]->unparsed ))
          $this->components[$six]->parse();
      }
    }
  }
/*********************************************************************************/
/*********************************************************************************/
/**
 * return a copy of this component
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.16 - 2007-11-07
 * @return object
 */
  function copy() {
    $serialized_contents = serialize($this);
    $copy = unserialize($serialized_contents);
    unset( $copy->propix );
    return $copy;
 }
/*********************************************************************************/
/*********************************************************************************/
/**
 * delete calendar subcomponent from component container
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-15
 * @param mixed $arg1 ordno / component type / component uid
 * @param mixed $arg2 optional, ordno if arg1 = component type
 * @return void
 */
  function deleteComponent( $arg1, $arg2=FALSE  ) {
    if( !isset( $this->components )) return FALSE;
    $argType = $index = null;
    if ( ctype_digit( (string) $arg1 )) {
      $argType = 'INDEX';
      $index   = (int) $arg1 - 1;
    }
    elseif(( strlen( $arg1 ) <= strlen( 'vfreebusy' )) && ( FALSE === strpos( $arg1, '@' ))) {
      $argType = strtolower( $arg1 );
      $index   = ( !empty( $arg2 ) && ctype_digit( (string) $arg2 )) ? (( int ) $arg2 - 1 ) : 0;
    }
    $cix2dC = 0;
    foreach ( $this->components as $cix => $component) {
      if( empty( $component )) continue;
      unset( $component->propix );
      if(( 'INDEX' == $argType ) && ( $index == $cix )) {
        unset( $this->components[$cix] );
        return TRUE;
      }
      elseif( $argType == $component->objName ) {
        if( $index == $cix2dC ) {
          unset( $this->components[$cix] );
          return TRUE;
        }
        $cix2dC++;
      }
      elseif( !$argType && ($arg1 == $component->getProperty( 'uid' ))) {
        unset( $this->components[$cix] );
        return TRUE;
      }
    }
    return FALSE;
  }
/**
 * get calendar component subcomponent from component container
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-15
 * @param mixed $arg1 optional, ordno/component type/ component uid
 * @param mixed $arg2 optional, ordno if arg1 = component type
 * @return object
 */
  function getComponent ( $arg1=FALSE, $arg2=FALSE ) {
    if( !isset( $this->components )) return FALSE;
    $index = $argType = null;
    if ( !$arg1 ) {
      $argType = 'INDEX';
      $index   = $this->compix['INDEX'] =
        ( isset( $this->compix['INDEX'] )) ? $this->compix['INDEX'] + 1 : 1;
    }
    elseif ( ctype_digit( (string) $arg1 )) {
      $argType = 'INDEX';
      $index   = (int) $arg1;
      unset( $this->compix );
    }
    elseif(( strlen( $arg1 ) <= strlen( 'vfreebusy' )) && ( FALSE === strpos( $arg1, '@' ))) {
      unset( $this->compix['INDEX'] );
      $argType = strtolower( $arg1 );
      if( !$arg2 )
        $index = $this->compix[$argType] =
        ( isset( $this->compix[$argType] )) ? $this->compix[$argType] + 1 : 1;
      else
        $index = (int) $arg2;
    }
    $index  -= 1;
    $ckeys = array_keys( $this->components );
    if( !empty( $index) && ( $index > end( $ckeys )))
      return FALSE;
    $cix2gC = 0;
    foreach( $this->components as $cix => $component ) {
      if( empty( $component )) continue;
      unset( $component->propix );
      if(( 'INDEX' == $argType ) && ( $index == $cix ))
        return $component->copy();
      elseif( $argType == $component->objName ) {
         if( $index == $cix2gC )
           return $component->copy();
         $cix2gC++;
      }
      elseif( !$argType && ( $arg1 == $component->getProperty( 'uid' ))) {
        unset( $component->propix );
        return $component->copy();
      }
    }
            /* not found.. . */
    unset( $this->compix );
    return false;
  }
/**
 * add calendar component as subcomponent to container for subcomponents
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 1.x.x - 2007-04-24
 * @param object $component calendar component
 * @return void
 */
  function addSubComponent ( $component ) {
    $this->setComponent( $component );
  }
/**
 * add calendar component as subcomponent to container for subcomponents
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.13 - 2008-09-24
 * @param object $component calendar component
 * @param mixed $arg1 optional, ordno/component type/ component uid
 * @param mixed $arg2 optional, ordno if arg1 = component type
 * @return bool
 */
  function setComponent( $component, $arg1=FALSE, $arg2=FALSE  ) {
    if( !isset( $this->components )) return FALSE;
    if( '' >= $component->getConfig( 'language'))
      $component->setConfig( 'language',  $this->getConfig( 'language' ));
    $component->setConfig( 'allowEmpty',  $this->getConfig( 'allowEmpty' ));
    $component->setConfig( 'nl',          $this->getConfig( 'nl' ));
    $component->setConfig( 'unique_id',   $this->getConfig( 'unique_id' ));
    $component->setConfig( 'format',      $this->getConfig( 'format' ));
    if( !in_array( $component->objName, array( 'valarm', 'vtimezone', 'standard', 'daylight' ))) {
      unset( $component->propix );
            /* make sure dtstamp and uid is set */
      $dummy = $component->getProperty( 'dtstamp' );
      $dummy = $component->getProperty( 'uid' );
    }
    if( !$arg1 ) {
      $this->components[] = $component->copy();
      return TRUE;
    }
    $argType = $index = null;
    if ( ctype_digit( (string) $arg1 )) {
      $argType = 'INDEX';
      $index   = (int) $arg1 - 1;
    }
    elseif(( strlen( $arg1 ) <= strlen( 'vfreebusy' )) && ( FALSE === strpos( $arg1, '@' ))) {
      $argType = strtolower( $arg1 );
      $index = ( ctype_digit( (string) $arg2 )) ? ((int) $arg2) - 1 : 0;
    }
    $cix2sC = 0;
    foreach ( $this->components as $cix => $component2 ) {
      if( empty( $component2 )) continue;
      unset( $component2->propix );
      if(( 'INDEX' == $argType ) && ( $index == $cix )) {
        $this->components[$cix] = $component->copy();
        return TRUE;
      }
      elseif( $argType == $component2->objName ) {
        if( $index == $cix2sC ) {
          $this->components[$cix] = $component->copy();
          return TRUE;
        }
        $cix2sC++;
      }
      elseif( !$argType && ($arg1 == $component2->getProperty( 'uid' ))) {
        $this->components[$cix] = $component->copy();
        return TRUE;
      }
    }
            /* not found.. . insert anyway.. .*/
    $this->components[] = $component->copy();
    return TRUE;
  }
/**
 * creates formatted output for subcomponents
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.10 - 2008-08-06
 * @return string
 */
  function createSubComponent() {
    $output = null;
    foreach( $this->components as $component ) {
      if( empty( $component )) continue;
      if( '' >= $component->getConfig( 'language'))
        $component->setConfig( 'language',  $this->getConfig( 'language' ));
      $component->setConfig( 'allowEmpty',  $this->getConfig( 'allowEmpty' ));
      $component->setConfig( 'nl',          $this->getConfig( 'nl' ));
      $component->setConfig( 'unique_id',   $this->getConfig( 'unique_id' ));
      $component->setConfig( 'format',      $this->getConfig( 'format' ));
      $output .= $component->createComponent( $this->xcaldecl );
    }
    return $output;
  }
/********************************************************************************/
/**
 * break lines at pos 75
 *
 * Lines of text SHOULD NOT be longer than 75 octets, excluding the line
 * break. Long content lines SHOULD be split into a multiple line
 * representations using a line "folding" technique. That is, a long
 * line can be split between any two characters by inserting a CRLF
 * immediately followed by a single linear white space character (i.e.,
 * SPACE, US-ASCII decimal 32 or HTAB, US-ASCII decimal 9). Any sequence
 * of CRLF followed immediately by a single linear white space character
 * is ignored (i.e., removed) when processing the content type.
 *
 * Edited 2007-08-26 by Anders Litzell, anders@litzell.se to fix bug where
 * the reserved expression "\n" in the arg $string could be broken up by the
 * folding of lines, causing ambiguity in the return string.
 * Fix uses var $breakAtChar=75 and breaks the line at $breakAtChar-1 if need be.
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.8 - 2006-09-03
 * @param string $value
 * @return string
 */
  function _size75( $string ) {
    $strlen = strlen( $string );
    $tmp    = $string;
    $string = null;
    while( $strlen > 75 ) {
       $breakAtChar = 75;
       if( substr( $tmp, ( $breakAtChar - 1 ), strlen( '\n' )) == '\n' )
         $breakAtChar = $breakAtChar - 1;
       $string .= substr( $tmp, 0, $breakAtChar );
       $string .= $this->nl;
       $tmp     = ' '.substr( $tmp, $breakAtChar );
       $strlen  = strlen( $tmp );
    } // while
    $string .= rtrim( $tmp ); // the rest
    if( $this->nl != substr( $string, ( 0 - strlen( $this->nl ))))
      $string .= $this->nl;
    return $string;
  }
/**
 * special characters management output
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.3.3 - 2007-12-20
 * @param string $string
 * @return string
 */
  function _strrep( $string ) {
    switch( $this->format ) {
      case 'xcal':
        $string = str_replace( '\n',  $this->nl, $string);
        $string = htmlspecialchars( strip_tags( stripslashes( urldecode ( $string ))));
        break;
      default:
        $pos = 0;
        while( $pos <= strlen( $string )) {
          $pos = strpos( $string, "\\", $pos );
          if( FALSE === $pos )
            break;
          if( !in_array( $string{($pos + 1)}, array( 'n', 'N', 'r', ',', ';' ))) {
            $string = substr( $string, 0, $pos )."\\".substr( $string, ( $pos + 1 ));
            $pos += 1;
          }
          $pos += 1;
        }
        if( FALSE !== strpos( $string, '"' ))
          $string = str_replace('"',   "'",       $string);
        if( FALSE !== strpos( $string, ',' ))
          $string = str_replace(',',   '\,',      $string);
        if( FALSE !== strpos( $string, ';' ))
          $string = str_replace(';',   '\;',      $string);
        if( FALSE !== strpos( $string, "\r\n" ))
          $string = str_replace( "\r\n", '\n',    $string);
        elseif( FALSE !== strpos( $string, "\r" ))
          $string = str_replace( "\r", '\n',      $string);
        if( FALSE !== strpos( $string, '\N' ))
          $string = str_replace( '\N', '\n',      $string);
//        if( FALSE !== strpos( $string, $this->nl ))
          $string = str_replace( $this->nl, '\n', $string);
        break;
    }
    return $string;
  }
/**
 * special characters management input (from iCal file)
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.3.3 - 2007-11-23
 * @param string $string
 * @return string
 */
  function _strunrep( $string ) {
    $string = str_replace( '\\\\', '\\',     $string);
    $string = str_replace( '\,',   ',',      $string);
    $string = str_replace( '\;',   ';',      $string);
//    $string = str_replace( '\n',  $this->nl, $string); // ??
    return $string;
  }
}
/*********************************************************************************/
/*********************************************************************************/
/**
 * class for calendar component VEVENT
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-12
 */
class vevent extends calendarComponent {
  var $attach;
  var $attendee;
  var $categories;
  var $comment;
  var $contact;
  var $class;
  var $created;
  var $description;
  var $dtend;
  var $dtstart;
  var $duration;
  var $exdate;
  var $exrule;
  var $geo;
  var $lastmodified;
  var $location;
  var $organizer;
  var $priority;
  var $rdate;
  var $recurrenceid;
  var $relatedto;
  var $requeststatus;
  var $resources;
  var $rrule;
  var $sequence;
  var $status;
  var $summary;
  var $transp;
  var $url;
  var $xprop;
            //  component subcomponents container
  var $components;
/**
 * constructor for calendar component VEVENT object
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-31
 * @return void
 */
  function vevent() {
    $this->calendarComponent();

    $this->attach          = '';
    $this->attendee        = '';
    $this->categories      = '';
    $this->class           = '';
    $this->comment         = '';
    $this->contact         = '';
    $this->created         = '';
    $this->description     = '';
    $this->dtstart         = '';
    $this->dtend           = '';
    $this->duration        = '';
    $this->exdate          = '';
    $this->exrule          = '';
    $this->geo             = '';
    $this->lastmodified    = '';
    $this->location        = '';
    $this->organizer       = '';
    $this->priority        = '';
    $this->rdate           = '';
    $this->recurrenceid    = '';
    $this->relatedto       = '';
    $this->requeststatus   = '';
    $this->resources       = '';
    $this->rrule           = '';
    $this->sequence        = '';
    $this->status          = '';
    $this->summary         = '';
    $this->transp          = '';
    $this->url             = '';
    $this->xprop           = '';

    $this->components      = array();

  }
/**
 * create formatted output for calendar component VEVENT object instance
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-07
 * @param array $xcaldecl
 * @return string
 */
  function createComponent( &$xcaldecl ) {
    $objectname    = $this->_createFormat();
    $component     = $this->componentStart1.$objectname.$this->componentStart2.$this->nl;
    $component    .= $this->createUid();
    $component    .= $this->createDtstamp();
    $component    .= $this->createAttach();
    $component    .= $this->createAttendee();
    $component    .= $this->createCategories();
    $component    .= $this->createComment();
    $component    .= $this->createContact();
    $component    .= $this->createClass();
    $component    .= $this->createCreated();
    $component    .= $this->createDescription();
    $component    .= $this->createDtstart();
    $component    .= $this->createDtend();
    $component    .= $this->createDuration();
    $component    .= $this->createExdate();
    $component    .= $this->createExrule();
    $component    .= $this->createGeo();
    $component    .= $this->createLastModified();
    $component    .= $this->createLocation();
    $component    .= $this->createOrganizer();
    $component    .= $this->createPriority();
    $component    .= $this->createRdate();
    $component    .= $this->createRrule();
    $component    .= $this->createRelatedTo();
    $component    .= $this->createRequestStatus();
    $component    .= $this->createRecurrenceid();
    $component    .= $this->createResources();
    $component    .= $this->createSequence();
    $component    .= $this->createStatus();
    $component    .= $this->createSummary();
    $component    .= $this->createTransp();
    $component    .= $this->createUrl();
    $component    .= $this->createXprop();
    $component    .= $this->createSubComponent();
    $component    .= $this->componentEnd1.$objectname.$this->componentEnd2;
    if( is_array( $this->xcaldecl ) && ( 0 < count( $this->xcaldecl ))) {
      foreach( $this->xcaldecl as $localxcaldecl )
        $xcaldecl[] = $localxcaldecl;
    }
    return $component;
  }
}
/*********************************************************************************/
/*********************************************************************************/
/**
 * class for calendar component VTODO
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-12
 */
class vtodo extends calendarComponent {
  var $attach;
  var $attendee;
  var $categories;
  var $comment;
  var $completed;
  var $contact;
  var $class;
  var $created;
  var $description;
  var $dtstart;
  var $due;
  var $duration;
  var $exdate;
  var $exrule;
  var $geo;
  var $lastmodified;
  var $location;
  var $organizer;
  var $percentcomplete;
  var $priority;
  var $rdate;
  var $recurrenceid;
  var $relatedto;
  var $requeststatus;
  var $resources;
  var $rrule;
  var $sequence;
  var $status;
  var $summary;
  var $url;
  var $xprop;
            //  component subcomponents container
  var $components;
/**
 * constructor for calendar component VTODO object
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-31
 * @return void
 */
  function vtodo() {
    $this->calendarComponent();

    $this->attach          = '';
    $this->attendee        = '';
    $this->categories      = '';
    $this->class           = '';
    $this->comment         = '';
    $this->completed       = '';
    $this->contact         = '';
    $this->created         = '';
    $this->description     = '';
    $this->dtstart         = '';
    $this->due             = '';
    $this->duration        = '';
    $this->exdate          = '';
    $this->exrule          = '';
    $this->geo             = '';
    $this->lastmodified    = '';
    $this->location        = '';
    $this->organizer       = '';
    $this->percentcomplete = '';
    $this->priority        = '';
    $this->rdate           = '';
    $this->recurrenceid    = '';
    $this->relatedto       = '';
    $this->requeststatus   = '';
    $this->resources       = '';
    $this->rrule           = '';
    $this->sequence        = '';
    $this->status          = '';
    $this->summary         = '';
    $this->url             = '';
    $this->xprop           = '';

    $this->components      = array();
  }
/**
 * create formatted output for calendar component VTODO object instance
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-11-07
 * @param array $xcaldecl
 * @return string
 */
  function createComponent( &$xcaldecl ) {
    $objectname    = $this->_createFormat();
    $component     = $this->componentStart1.$objectname.$this->componentStart2.$this->nl;
    $component    .= $this->createUid();
    $component    .= $this->createDtstamp();
    $component    .= $this->createAttach();
    $component    .= $this->createAttendee();
    $component    .= $this->createCategories();
    $component    .= $this->createClass();
    $component    .= $this->createComment();
    $component    .= $this->createCompleted();
    $component    .= $this->createContact();
    $component    .= $this->createCreated();
    $component    .= $this->createDescription();
    $component    .= $this->createDtstart();
    $component    .= $this->createDue();
    $component    .= $this->createDuration();
    $component    .= $this->createExdate();
    $component    .= $this->createExrule();
    $component    .= $this->createGeo();
    $component    .= $this->createLastModified();
    $component    .= $this->createLocation();
    $component    .= $this->createOrganizer();
    $component    .= $this->createPercentComplete();
    $component    .= $this->createPriority();
    $component    .= $this->createRdate();
    $component    .= $this->createRelatedTo();
    $component    .= $this->createRequestStatus();
    $component    .= $this->createRecurrenceid();
    $component    .= $this->createResources();
    $component    .= $this->createRrule();
    $component    .= $this->createSequence();
    $component    .= $this->createStatus();
    $component    .= $this->createSummary();
    $component    .= $this->createUrl();
    $component    .= $this->createXprop();
    $component    .= $this->createSubComponent();
    $component    .= $this->componentEnd1.$objectname.$this->componentEnd2;
    if( is_array( $this->xcaldecl ) && ( 0 < count( $this->xcaldecl ))) {
      foreach( $this->xcaldecl as $localxcaldecl )
        $xcaldecl[] = $localxcaldecl;
    }
    return $component;
  }
}
/*********************************************************************************/
/*********************************************************************************/
/**
 * class for calendar component VJOURNAL
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-12
 */
class vjournal extends calendarComponent {
  var $attach;
  var $attendee;
  var $categories;
  var $comment;
  var $contact;
  var $class;
  var $created;
  var $description;
  var $dtstart;
  var $exdate;
  var $exrule;
  var $lastmodified;
  var $organizer;
  var $rdate;
  var $recurrenceid;
  var $relatedto;
  var $requeststatus;
  var $rrule;
  var $sequence;
  var $status;
  var $summary;
  var $url;
  var $xprop;
/**
 * constructor for calendar component VJOURNAL object
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-31
 * @return void
 */
  function vjournal() {
    $this->calendarComponent();

    $this->attach          = '';
    $this->attendee        = '';
    $this->categories      = '';
    $this->class           = '';
    $this->comment         = '';
    $this->contact         = '';
    $this->created         = '';
    $this->description     = '';
    $this->dtstart         = '';
    $this->exdate          = '';
    $this->exrule          = '';
    $this->lastmodified    = '';
    $this->organizer       = '';
    $this->rdate           = '';
    $this->recurrenceid    = '';
    $this->relatedto       = '';
    $this->requeststatus   = '';
    $this->rrule           = '';
    $this->sequence        = '';
    $this->status          = '';
    $this->summary         = '';
    $this->url             = '';
    $this->xprop           = '';
  }
/**
 * create formatted output for calendar component VJOURNAL object instance
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-12
 * @param array $xcaldecl
 * @return string
 */
  function createComponent( &$xcaldecl ) {
    $objectname = $this->_createFormat();
    $component  = $this->componentStart1.$objectname.$this->componentStart2.$this->nl;
    $component .= $this->createUid();
    $component .= $this->createDtstamp();
    $component .= $this->createAttach();
    $component .= $this->createAttendee();
    $component .= $this->createCategories();
    $component .= $this->createClass();
    $component .= $this->createComment();
    $component .= $this->createContact();
    $component .= $this->createCreated();
    $component .= $this->createDescription();
    $component .= $this->createDtstart();
    $component .= $this->createExdate();
    $component .= $this->createExrule();
    $component .= $this->createLastModified();
    $component .= $this->createOrganizer();
    $component .= $this->createRdate();
    $component .= $this->createRequestStatus();
    $component .= $this->createRecurrenceid();
    $component .= $this->createRelatedTo();
    $component .= $this->createRrule();
    $component .= $this->createSequence();
    $component .= $this->createStatus();
    $component .= $this->createSummary();
    $component .= $this->createUrl();
    $component .= $this->createXprop();
    $component .= $this->componentEnd1.$objectname.$this->componentEnd2;
    if( is_array( $this->xcaldecl ) && ( 0 < count( $this->xcaldecl ))) {
      foreach( $this->xcaldecl as $localxcaldecl )
        $xcaldecl[] = $localxcaldecl;
    }
    return $component;
  }
}
/*********************************************************************************/
/*********************************************************************************/
/**
 * class for calendar component VFREEBUSY
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-12
 */
class vfreebusy extends calendarComponent {
  var $attendee;
  var $comment;
  var $contact;
  var $dtend;
  var $dtstart;
  var $duration;
  var $freebusy;
  var $organizer;
  var $requeststatus;
  var $url;
  var $xprop;
            //  component subcomponents container
  var $components;
/**
 * constructor for calendar component VFREEBUSY object
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-31
 * @return void
 */
  function vfreebusy() {
    $this->calendarComponent();

    $this->attendee        = '';
    $this->comment         = '';
    $this->contact         = '';
    $this->dtend           = '';
    $this->dtstart         = '';
    $this->duration        = '';
    $this->freebusy        = '';
    $this->organizer       = '';
    $this->requeststatus   = '';
    $this->url             = '';
    $this->xprop           = '';
  }
/**
 * create formatted output for calendar component VFREEBUSY object instance
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.3.1 - 2007-11-19
 * @param array $xcaldecl
 * @return string
 */
  function createComponent( &$xcaldecl ) {
    $objectname = $this->_createFormat();
    $component  = $this->componentStart1.$objectname.$this->componentStart2.$this->nl;
    $component .= $this->createUid();
    $component .= $this->createDtstamp();
    $component .= $this->createAttendee();
    $component .= $this->createComment();
    $component .= $this->createContact();
    $component .= $this->createDtstart();
    $component .= $this->createDtend();
    $component .= $this->createDuration();
    $component .= $this->createFreebusy();
    $component .= $this->createOrganizer();
    $component .= $this->createRequestStatus();
    $component .= $this->createUrl();
    $component .= $this->createXprop();
    $component .= $this->componentEnd1.$objectname.$this->componentEnd2;
    if( is_array( $this->xcaldecl ) && ( 0 < count( $this->xcaldecl ))) {
      foreach( $this->xcaldecl as $localxcaldecl )
        $xcaldecl[] = $localxcaldecl;
    }
    return $component;
  }
}
/*********************************************************************************/
/*********************************************************************************/
/**
 * class for calendar component VALARM
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-12
 */
class valarm extends calendarComponent {
  var $action;
  var $attach;
  var $attendee;
  var $description;
  var $duration;
  var $repeat;
  var $summary;
  var $trigger;
  var $xprop;
/**
 * constructor for calendar component VALARM object
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-31
 * @return void
 */
  function valarm() {
    $this->calendarComponent();

    $this->action          = '';
    $this->attach          = '';
    $this->attendee        = '';
    $this->description     = '';
    $this->duration        = '';
    $this->repeat          = '';
    $this->summary         = '';
    $this->trigger         = '';
    $this->xprop           = '';
  }
/**
 * create formatted output for calendar component VALARM object instance
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-22
 * @param array $xcaldecl
 * @return string
 */
  function createComponent( &$xcaldecl ) {
    $objectname    = $this->_createFormat();
    $component     = $this->componentStart1.$objectname.$this->componentStart2.$this->nl;
    $component    .= $this->createAction();
    $component    .= $this->createAttach();
    $component    .= $this->createAttendee();
    $component    .= $this->createDescription();
    $component    .= $this->createDuration();
    $component    .= $this->createRepeat();
    $component    .= $this->createSummary();
    $component    .= $this->createTrigger();
    $component    .= $this->createXprop();
    $component    .= $this->componentEnd1.$objectname.$this->componentEnd2;
    return $component;
  }
}
/**********************************************************************************
/*********************************************************************************/
/**
 * class for calendar component VTIMEZONE
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-12
 */
class vtimezone extends calendarComponent {
  var $timezonetype;

  var $comment;
  var $dtstart;
  var $lastmodified;
  var $rdate;
  var $rrule;
  var $tzid;
  var $tzname;
  var $tzoffsetfrom;
  var $tzoffsetto;
  var $tzurl;
  var $xprop;
            //  component subcomponents container
  var $components;
/**
 * constructor for calendar component VTIMEZONE object
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-31
 * @param string $timezonetype optional, default FALSE ( STANDARD / DAYLIGHT )
 * @return void
 */
  function vtimezone( $timezonetype=FALSE ) {
    if( !$timezonetype )
      $this->timezonetype = 'VTIMEZONE';
    else
      $this->timezonetype = strtoupper( $timezonetype );
    $this->calendarComponent();

    $this->comment         = '';
    $this->dtstart         = '';
    $this->lastmodified    = '';
    $this->rdate           = '';
    $this->rrule           = '';
    $this->tzid            = '';
    $this->tzname          = '';
    $this->tzoffsetfrom    = '';
    $this->tzoffsetto      = '';
    $this->tzurl           = '';
    $this->xprop           = '';

    $this->components      = array();
  }
/**
 * create formatted output for calendar component VTIMEZONE object instance
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.5.1 - 2008-10-25
 * @param array $xcaldecl
 * @return string
 */
  function createComponent( &$xcaldecl ) {
    $objectname    = $this->_createFormat();
    $component     = $this->componentStart1.$objectname.$this->componentStart2.$this->nl;
    $component    .= $this->createTzid();
    $component    .= $this->createLastModified();
    $component    .= $this->createTzurl();
    $component    .= $this->createDtstart();
    $component    .= $this->createTzoffsetfrom();
    $component    .= $this->createTzoffsetto();
    $component    .= $this->createComment();
    $component    .= $this->createRdate();
    $component    .= $this->createRrule();
    $component    .= $this->createTzname();
    $component    .= $this->createXprop();
    $component    .= $this->createSubComponent();
    $component    .= $this->componentEnd1.$objectname.$this->componentEnd2;
    if( is_array( $this->xcaldecl ) && ( 0 < count( $this->xcaldecl ))) {
      foreach( $this->xcaldecl as $localxcaldecl )
        $xcaldecl[] = $localxcaldecl;
    }
    return $component;
  }
}
?>